UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                 Amendment No. 4

                    Under the Securities Exchange Act of 1934
                 Information to be included in statements filed
                    pursuant to Rule 13D-1(A) and Amendments
                     thereto filed pursuant to Rule 13D-2(A)

                               Global Signal Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $0.01 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   37944Q 10 3
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                Randal A. Nardone
                                    Secretary
                      Fortress Registered Investment Trust
                        c/o Fortress Investment Group LLC
                           1345 Avenue of the Americas
                            New York, New York 10105
                                 (212) 798-6100
--------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                    COPY TO:
                              Joseph A. Coco, Esq.
                    Skadden, Arps, Slate, Meagher & Flom LLP
                                Four Times Square
                            New York, New York 10036
                                 (212) 735-3000

                                December 9, 2005
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

     If the filing person has previously  filed a statement on Schedule 13G to
report the acquisition that is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g),  check
the following box. [ ]

     *The  remainder  of this cover  page shall be filled out for a  reporting
person's  initial  filing on this form with  respect to the  subject  class of
securities,  and for any subsequent  amendment  containing  information  which
would alter disclosures provided in a prior cover page.

     The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities  Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however,  see
the Notes).



                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 2 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   FRIT PINN LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   WC/AF
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                            [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES
                           ----------------------------------------------------
      BENEFICIALLY         8        SHARED VOTING POWER
                                    -19,162,248-
         OWNED BY          ----------------------------------------------------

          EACH             9        SOLE DISPOSITIVE POWER
                                    -0-
        REPORTING          ----------------------------------------------------

         PERSON            10       SHARED DISPOSITIVE POWER
                                    -19,162,248-
          WITH
-------------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   -19,162,248-
-------------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
   SHARES (See Instructions)                [ ]
-------------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
   27.9% (based on 68,619,155 shares of common stock outstanding as of
   November 4, 2005)
-------------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON (See Instructions)
   OO
-------------------------------------------------------------------------------



                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 3 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Registered Investment Trust
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   WC/AF
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                           [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES            ----------------------------------------------------
                           8        SHARED   VOTING   POWER   -20,306,252*-
      BENEFICIALLY                  (inclusive of 644,000 shares issuable upon
                                    exercise of options  beneficially owned by
        OWNED BY                    the reporting person which are exercisable
                                    as of or  within  60 days of  December  9,
          EACH                      2005)

        REPORTING          ----------------------------------------------------
                           9        SOLE DISPOSITIVE POWER
          PERSON                          -0-

          WITH             ----------------------------------------------------
                           10       SHARED DISPOSITIVE POWER
                                    -20,306,252*-
-------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -20,306,252-
-------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                    [ ]
-------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    29.3% (based on 68,619,155 shares of common stock outstanding as of
    November 4, 2005 and including 644,000 issuable upon exercise of options
    beneficially owned by the reporting person which are exercisable as of or
    within 60 days of December 9, 2005)
-------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
-------------------------------------------------------------------------------
*  19,162,248 shares solely in its capacity as the sole member of FRIT PINN LLC.



                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 4 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Pinnacle Investment Fund LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   WC
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                           [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-
                           -----------------------------------------------------
         SHARES            8        SHARED VOTING POWER
                                    -5,137,444-
      BENEFICIALLY
                           -----------------------------------------------------
        OWNED BY
                           9        SOLE DISPOSITIVE POWER
          EACH                      -0-

        REPORTING          -----------------------------------------------------
                           10       SHARED DISPOSITIVE POWER
         PERSON                     -5,137,444-

          WITH
--------------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   -5,137,444-
--------------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
   SHARES (See Instructions)                     [ ]
--------------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
   7.5% (based on 68,619,155 shares of common stock outstanding as of
   November 4, 2005)
--------------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON (See Instructions)
   IV
--------------------------------------------------------------------------------



                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                     Page 5 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   FIG Advisors LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                          [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES            -----------------------------------------------------
                           8        SHARED VOTING POWER
      BENEFICIALLY                  -5,137,444-

        OWNED BY           -----------------------------------------------------
                           9        SOLE DISPOSITIVE POWER
          EACH                      -0-

        REPORTING          -----------------------------------------------------
                           10       SHARED DISPOSITIVE POWER
         PERSON                     -5,137,444-

          WITH
--------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -5,137,444-
-------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                     [ ]
-------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    7.5% (based on 68,619,155 shares of common stock outstanding as of
    November 4, 2005)
-------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    IA
-------------------------------------------------------------------------------
*  Solely in its capacity as the investment advisor of Fortress Pinnacle
   Investment Fund LLC




SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 6 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Robert H. Gidel
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                           [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   United States of America
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -25,000-

         SHARES
                           -----------------------------------------------------
      BENEFICIALLY         8        SHARED VOTING POWER
                                    -5,137,444*-
        OWNED BY
                           -----------------------------------------------------
          EACH             9        SOLE DISPOSITIVE POWER
                                    -25,000-
        REPORTING
                           -----------------------------------------------------
         PERSON            10       SHARED DISPOSITIVE POWER
                                    -5,137,444*-
          WITH
--------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -5,162,444-
--------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                 [ ]
--------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    7.5% (based on 68,619,155 shares of common stock outstanding as of
    November 4, 2005)
--------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    IN
--------------------------------------------------------------------------------
*   Solely in his capacity as the sole manager of Fortress Pinnacle Investment
    Fund LLC.




                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 7 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Investment Fund LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                            [ ]
 -------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES
                           -----------------------------------------------------
      BENEFICIALLY
                           8        SHARED VOTING POWER
        OWNED BY                    -20,306,252*- (inclusive of 644,000 shares
                                    issuable upon exercise of options
          EACH                      beneficially owned by the reporting person
                                    which are exercisable as of or within 60
        REPORTING                   days of December 9, 2005)

         PERSON
                           -----------------------------------------------------
          WITH             9        SOLE DISPOSITIVE POWER
                                    -0-
                           -----------------------------------------------------
                           10       SHARED DISPOSITIVE POWER
                                    -20,306,252*-
--------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -20,306,252-
-------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                 [ ]
-------------------------------------------------------------------------------
13   PERCENT  OF CLASS  REPRESENTED  BY  AMOUNT  IN ROW (11)  29.3%  (based on
     68,619,155  shares of common stock outstanding as of November 4, 2005 and
     including  644,000 shares issuable upon exercise of options  beneficially
     owned by the reporting  person which are  exercisable  as of or within 60
     days of December 9, 2005)
-------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
-------------------------------------------------------------------------------
*   Solely in its capacity as the holder of all issued and outstanding shares
    of beneficial interest of Fortress Registered Investment Trust.





                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 8 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Fund MM LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                              [ ]
 -------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES
                           -----------------------------------------------------
      BENEFICIALLY
                           8        SHARED VOTING POWER
        OWNED BY                    -20,306,252*- (inclusive of 644,000 shares
                                    issuable upon exercise of options
          EACH                      beneficially owned by the reporting person
                                    which are exercisable as of or within 60
        REPORTING                   days of December 9, 2005)

         PERSON
                           -----------------------------------------------------
          WITH             9        SOLE DISPOSITIVE POWER
                                    -0-
                           -----------------------------------------------------
                           10       SHARED DISPOSITIVE POWER
                                    -20,306,252*-
--------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -20,306,252-
--------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                     [ ]
--------------------------------------------------------------------------------
13  PERCENT  OF CLASS  REPRESENTED  BY  AMOUNT  IN ROW (11)  29.3%  (based  on
    68,619,155  shares of common stock  outstanding as of November 4, 2005 and
    including  644,000 shares  issuable upon exercise of options  beneficially
    owned by the  reporting  person which are  exercisable  as of or within 60
    days of December 9, 2005)
--------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
--------------------------------------------------------------------------------
*  Solely in its capacity as the managing member of Fortress Investment
   Fund LLC.




                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 9 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   FIT GSL LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   WC
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                      [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES
                           -----------------------------------------------------
      BENEFICIALLY         8        SHARED VOTING POWER
                                    -4,705,883-
        OWNED BY
                           -----------------------------------------------------
          EACH             9        SOLE DISPOSITIVE POWER
                                    -0-
        REPORTING
                           -----------------------------------------------------
         PERSON            10       SHARED DISPOSITIVE POWER
                                    -4,705,883-
          WITH
-------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -4,705,883-
-------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                     [ ]
-------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    6.9% (based on 68,619,155 shares of common stock outstanding as of
    November 4, 2005)
-------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
-------------------------------------------------------------------------------




                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                     Page 10 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Investment Trust II
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)

-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES
                           -----------------------------------------------------
      BENEFICIALLY         8        SHARED VOTING POWER
                                    -4,705,883-*
       OWNED BY
                           -----------------------------------------------------
          EACH             9        SOLE DISPOSITIVE POWER
                                    -0-
        REPORTING
                           -----------------------------------------------------
         PERSON            10       SHARED DISPOSITIVE POWER
                                    -4,705,883-*
          WITH
-------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -4,705,883-
-------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)               [ ]
-------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    6.9% (based on 68,619,155 shares of common stock outstanding as of
    November 4, 2005)
-------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
-------------------------------------------------------------------------------
*   Solely in its capacity as the holder of all issued and outstanding shares of
    beneficial interest of FIT GSL LLC.




                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                    Page 11 of 16 Pages
-------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
    Fortress Investment Fund II LLC
-------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
    (See Instructions)                          (a)  | |
                                                (b)  | |
-------------------------------------------------------------------------------
3   SEC USE ONLY

-------------------------------------------------------------------------------
4   SOURCE OF FUNDS (See Instructions)
    Not Applicable
-------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
    TO ITEMS 2(d) or 2(e)                      [ ]
-------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION
    Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES
                           -----------------------------------------------------
      BENEFICIALLY         8        SHARED VOTING POWER
                                    -4,705,883-*
         OWNED BY
                           -----------------------------------------------------
          EACH             9        SOLE DISPOSITIVE POWER
                                    -0-
        REPORTING
                           -----------------------------------------------------
         PERSON            10       SHARED DISPOSITIVE POWER
                                    -4,705,883-*
          WITH
-------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -4,705,883-
-------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                 [ ]
-------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    6.9% (based on 68,619,155 shares of common stock outstanding as of
    November 4, 2005)
-------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
-------------------------------------------------------------------------------
*   Solely in its capacity as the holder of a majority of the issued and
    outstanding  shares of beneficial interest of Fortress Investment Trust II.





                                  SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                     Page 12 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Fund MM II LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                  [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES
                           -----------------------------------------------------
      BENEFICIALLY         8        SHARED VOTING POWER
                                    -4,705,883*-
        OWNED BY
                           -----------------------------------------------------
          EACH             9        SOLE DISPOSITIVE POWER
                                    -0-
        REPORTING
                           -----------------------------------------------------
         PERSON            10       SHARED DISPOSITIVE POWER
                                    -4,705,883*-
          WITH
-------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -4,705,883-
-------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                     [ ]
-------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    6.9% (based on 68,619,155 shares of common stock outstanding as of
    November 4, 2005)
-------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
-------------------------------------------------------------------------------
*   Solely in its capacity as the managing member of Fortress Investment Fund II
    LLC.




                                  SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                      Page 13 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Investment Group LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                      [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES            ----------------------------------------------------
                           8        SHARED VOTING POWER
      BENEFICIALLY                  -31,047,879*- (inclusive of 644,000 shares
                                    issuable upon exercise of options
       OWNED BY                     beneficially owned by the reporting person
                                    which are exercisable as of or within 60
          EACH                      days of December 9, 2005)

        REPORTING
                           -----------------------------------------------------
         PERSON            9        SOLE DISPOSITIVE POWER
                                    -0-
          WITH             -----------------------------------------------------
                           10       SHARED DISPOSITIVE POWER
                                    -31,047,879*-
-------------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   -31,047,879-
-------------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
   SHARES (See Instructions)                     [ ]
-------------------------------------------------------------------------------
13 PERCENT OF CLASS  REPRESENTED  BY AMOUNT IN ROW (11) 44.8%  (based on
   68,619,155  shares of common stock outstanding as of November 4, 2005
   and  including  644,000  shares  issuable  upon  exercise  of options
   beneficially  owned by the reporting  person which are exercisable as
   of or within 60 days of December 9, 2005)
-------------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON (See Instructions)
   OO
-------------------------------------------------------------------------------

*  4,705,883 shares solely in its capacity as the managing member of Fortress
   Fund MM II LLC,  20,306,252  shares  solely in its capacity as the managing
   member of Fortress Fund MM LLC,  5,137,444 shares solely in its capacity as
   the holder of all issued and outstanding  shares of beneficial  interest of
   FIG Advisors LLC, and 898,300 shares solely in its capacity as the managing
   member of Drawbridge Global Macro Fund Advisors LLC.




                                 SCHEDULE 13D

-------------------------------------------------------------------------------
CUSIP No.  37944Q 10 3                                    Page 14 of 16 Pages
-------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
   Fortress Investment Holdings LLC
-------------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   (See Instructions)                          (a)  | |
                                               (b)  | |
-------------------------------------------------------------------------------
3  SEC USE ONLY

-------------------------------------------------------------------------------
4  SOURCE OF FUNDS (See Instructions)
   Not Applicable
-------------------------------------------------------------------------------
5  CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
   TO ITEMS 2(d) or 2(e)                             [ ]
-------------------------------------------------------------------------------
6  CITIZENSHIP OR PLACE OF ORGANIZATION
   Delaware
-------------------------------------------------------------------------------
                           7        SOLE VOTING POWER
        NUMBER OF                   -0-

         SHARES            -----------------------------------------------------
                           8        SHARED VOTING POWER
      BENEFICIALLY                  -31,047,879*- (inclusive of 644,000 shares
                                    issuable upon exercise of options
        OWNED BY                    beneficially owned by the reporting person
                                    which are exercisable as of or within 60
          EACH                      days of December 9, 2005)

        REPORTING          -----------------------------------------------------
                           9        SOLE DISPOSITIVE POWER
         PERSON                     -0-
                           -----------------------------------------------------
          WITH             10       SHARED DISPOSITIVE POWER
                                    -31,047,879*-
--------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    -31,047,879-
--------------------------------------------------------------------------------
12  CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES (See Instructions)                             [ ]
--------------------------------------------------------------------------------
13  PERCENT OF CLASS  REPRESENTED  BY AMOUNT IN ROW (11) 44.8%  (based on
    68,619,155  shares of common stock outstanding as of November 4, 2005
    and  including  644,000  shares  issuable  upon  exercise  of options
    beneficially  owned by the reporting  person which are exercisable as
    of or within 60 days of December 9, 2005)
--------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON (See Instructions)
    OO
--------------------------------------------------------------------------------
*   Solely in its capacity as the sole member of Fortress Investment Group LLC.





     The item numbers and responses  thereto below are in accordance  with the
requirements of Schedule 13D.

     This  Amendment  No. 4 (this  "Amendment")  amends  and  supplements  the
Schedule 13D filed on January 3, 2005,  as amended by Amendment  No. 1 thereto
filed on February 16, 2005, as amended by Amendment No. 2 thereto filed on May
11, 2005,  and as amended by Amendment No. 3 thereto filed on May 31, 2005 (as
so amended,  the "Schedule  13D"),  by FRIT PINN LLC ("FRIT  PINN"),  Fortress
Registered  Investment Trust ("FRIT"),  Fortress Pinnacle  Investment Fund LLC
("FPIF"),  FIG  Advisors LLC  ("FIGA"),  Robert H. Gidel  ("Gidel"),  Fortress
Investment Fund LLC ("FIF"),  Fortress Fund MM LLC ("FFMM"), FIT GSL LLC ("FIT
GSL"),  Fortress  Investment Trust II ("FIT II"),  Fortress Investment Fund II
("FIF II"), Fortress Fund MM II LLC ("FFMMII"),  Fortress Investment Group LLC
("FIG"),  and Fortress  Investment  Holdings LLC ("FIH" and together with FRIT
PINN,  FRIT, FPIF,  FIGA,  Gidel,  FIF, FFMM, FIT GSL, FIT II, FIF II, FFMMII,
FIG, the "Reporting  Persons") with respect to the shares of common stock, par
value $0.01 per share (the "Common Stock"),  of Global Signal Inc., a Delaware
corporation (the "Issuer").  All capitalized  terms used in this Amendment and
not otherwise  defined herein have the meanings  assigned to such terms in the
Schedule 13D.


Item 6.  Contracts, Arrangements, Understandings or Relationships With Respect
to Securities of the Issuer.

     FRIT has  replaced the Credit  Agreement,  dated as of December 21, 2004,
between FRIT PINN and Bank of America,  N.A.,  Morgan  Stanley  Asset  Funding
Inc.,  the other lenders that may become  parties  thereto and Banc of America
Securities LLC (the "Old Credit  Agreement"),  with the FRIT Credit  Agreement
discussed  below.  No shares of the Issuer's Common Stock remain pledged under
the Old Credit Agreement.

     FRIT entered into a credit agreement,  dated as of December 9, 2005, with
Deutsche Bank AG, London Branch and the other lenders that may become  parties
thereto (the "FRIT Credit Agreement").  Pursuant to the FRIT Credit Agreement,
FRIT borrowed $464.4 million from the  lenders  thereunder  and this amount is
secured by a pledge of a total of  19,659,324  shares of the  Issuer's  Common
Stock,  consisting  of a pledge by FRIT of a total of 497,076  shares owned by
FRIT and a pledge by FRIT PINN of a total of  19,162,248  shares owned by FRIT
PINN.  The term of the FRIT  Credit  Agreement  is 12 months with a  six-month
extension at the option of the lenders.  The 19,659,324 shares of Common Stock
represents  approximately  28.6% of the Issuer's issued and outstanding Common
Stock as of November 4, 2005.

     In addition, FIT II entered into a credit agreement, dated as of December
9, 2005,  with  Deutsche Bank AG, London Branch and the other lenders that may
become parties thereto (the "FIT II Credit  Agreement",  and together with the
FRIT Credit Agreement,  the "New Credit  Agreements").  Pursuant to the FIT II
Credit Agreement, FIT II borrowed $228.3 million  from the lenders  thereunder
and this  amount is  secured  by a pledge  by FIT GSL of a total of  4,705,883
shares of the  Issuer's  Common Stock owned by FIT GSL. The term of the FIT II
Credit Agreement is 12 months with a  six-month extension at the option of the
lenders. The 4,705,883 shares of Common  Stock  represents approximately  6.9%
of the Issuer's issued and outstanding  Common Stock as of November 4, 2005.

     The New Credit Agreements contain representations,  covenants and default
provisions  relating to FRIT, FRIT PINN, FIT II, FIT GSL, and the Issuer,  and
also require  prepayment of a portion of the  borrowings by FRIT and FIT II in
the event the trading  price of the  Issuer's  Common  Stock  decreases  below
certain  specified  levels.  In the  event of a default  under the New  Credit
Agreements  by FRIT or FIT II,  the  lenders  may  foreclose  upon any and all
shares of Common Stock pledged to them. FRIT and FIT II have agreed in the New
Credit Agreements that if a shelf registration  statement is not effective and
usable for resales of any portion of the pledged  common  stock by the lenders
or their  assignees (in the event of foreclosure) as of March 9, 2006, FRIT or
FIT II, as applicable, will prepay a related portion of their borrowings.

     Except as provided in the Amended and Restated  Investor  Agreement,  the
Option Agreement, the Credit Agreements or as set forth herein, neither any of
the Reporting Persons nor, to the best of such Reporting  Persons'  knowledge,
any of the Covered Persons has any contracts, arrangements,  understandings or
relationships  (legal or  otherwise),  with any  person  with  respect  to any
securities of the Issuer, including, but not limited to, transfer or voting of
any securities,  finder's fees, joint ventures,  loan or option  arrangements,
puts or calls,  guarantees of profits,  division of profits or losses,  or the
giving or withholding of proxies.




                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS PINNACLE INVESTMENT FUND LLC


                                           By: /s/ Robert H. Gidel
                                               ---------------------------------
                                               Robert H. Gidel
                                               as sole manager of Fortress
                                               Pinnacle Investment Fund LLC


                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FIG ADVISORS LLC


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer of
                                               Fortress Investment Group LLC,
                                               managing member of FIG
                                               Advisors LLC


                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                                 ROBERT H. GIDEL

                                                 /s/ Robert H. Gidel
                                                 -------------------------------
                                                 Robert H. Gidel




                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FRIT PINN LLC


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Vice President and Secretary


                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS REGISTERED INVESTMENT TRUST


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer
                                               and Secretary


                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS INVESTMENT FUND LLC


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer and
                                               Secretary of Fortress
                                               Fund MM LLC, managing member of
                                               Fortress Investment Fund LLC






                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS FUND MM LLC


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer
                                               and Secretary


                                   SIGNATURE

       After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FIT GSL LLC

                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer
                                               and Secretary



                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS INVESTMENT TRUST II


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer and
                                               Secretary







                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS INVESTMENT FUND II LLC


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer
                                               and Secretary of Fortress
                                               Fund MM II LLC, managing
                                               member of Fortress Investment
                                               Fund II LLC


                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS FUND MM II LLC


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer and
                                               Secretary


                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS INVESTMENT GROUP LLC


                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               as Chief Operating Officer






                                   SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  December 12, 2005

                                           FORTRESS INVESTMENT HOLDINGS LLC

                                           By: /s/ Randal A. Nardone
                                               ---------------------------------
                                               Randal A. Nardone
                                               As Manager