UNITED STATES

OMB APPROVAL

SECURITIES AND EXCHANGE
COMMISSION

OMB Number:
3235-0145

Washington, D.C. 20549

Expires: February
28, 2009

SCHEDULE 13D

Estimated average
burden hours per
response. . 14.5

Item 1.

Security and Issuer

This Amendment No. 1 (the “Amendment No. 1”) relates to the Common Stock, par value $0.01 per share (the “Common Stock”), of TESSCO Technologies Incorporated, a Delaware corporation (the “Company”), which has its principal executive offices at 11126 McCormick Road, Hunt Valley, Maryland 21031.  This Amendment No. 1 amends and supplements, as set forth below, the information contained in items 1, 2, 3 and 5 of the Schedule 13D filed by the Reporting Persons on March 14, 2008 (the “Schedule 13D”).  All capitalized terms used herein but not defined herein have the meanings set forth in the Schedule 13D.  Except as amended by this Amendment No. 1, all information contained in the Schedule 13D is, after reasonable inquiry and to the best of the Reporting Persons’ knowledge and belief, true, complete and correct as of the date of this Amendment No. 1.

Item 2.

Identity and Background

Item 2 of the Schedule 13D is hereby amended by adding the following as the second line thereof:

Discovery Equity Partners, L.P. (“Discovery Equity Partners”) is an Illinois limited partnership primarily engaged in the business of investing in securities.

Item 3.

Source and Amount of Funds or Other Consideration

Item 3 of the Schedule 13D is amended to read in its entirety as follows:

The total purchase price for the 353,676 shares of Common Stock beneficially owned by Discovery Group and Messrs. Donoghue and Murphy as of April 11, 2008 was approximately $5,827,368, and the total purchase price for the 303,003 shares of Common Stock beneficially owned by Discovery Equity Partners was approximately $4,985,790.  The source of such funds was the assets of Discovery Equity Partners and another private investment partnership (collectively, the “Partnerships”) over which Discovery Group exercises discretionary investment management authority, including proceeds of margin loans under margin loan facilities maintained in the ordinary course of business by the Partnerships with a broker on customary terms and conditions.  The Partnerships are the legal owner of all of the Common Stock beneficially owned by Discovery Group and Messrs. Donoghue and Murphy.

Item 5.

Interest in Securities of the Issuer

Item 5 of the Schedule 13D is amended to read in its entirety as follows:

The information concerning percentages of ownership set forth below is based on 5,154,973 shares of Common Stock reported outstanding as of February 1, 2008 in the Company’s most recent Quarterly Report on Form 10-Q, for the period ended December 30, 2007.

Discovery Equity Partners beneficially owns 303,003 shares of Common Stock as of April 11, 2008, which represents 5.9% of the outstanding Common Stock.

Discovery Group beneficially owns 353,676 shares of Common Stock as of April 11, 2008, which represents 6.9% of the outstanding Common Stock.

Mr. Donoghue beneficially owns 353,676 shares of Common Stock as of April 11, 2008, which represents 6.9% of the outstanding Common Stock.

Mr. Murphy beneficially owns 353,676 shares of Common Stock as of April 11, 2008, which represents 6.9% of the outstanding Common Stock.

Discovery Group is the sole general partner of Discovery Equity Partners and has sole discretionary investment authority with respect to the other Partnership’s investment in the Common Stock.  Messrs. Donoghue and Murphy are the sole managing members of Discovery Group.  As a consequence, Discovery Group and Messrs. Donoghue and Murphy may be deemed to share beneficial ownership of all of the shares of Common Stock owned by both of the Partnerships, while Discovery Equity Partners shares beneficial ownership with Discovery Group and Messrs. Donoghue and Murphy of only the shares of Common Stock owned by it.

The transactions in Common Stock effected by the Reporting Persons since the date of the most recent filing on Schedule 13D are set out in Exhibit 1 hereto.

No person other than the Partnerships is known to any Reporting Person to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, any of the shares of Common Stock reported herein.

Item 7.

Material to be Filed as Exhibits

Exhibit 1:                        List of transactions by Reporting Persons in the Company’s Common Stock since the date of the most recent filing on Schedule 13D.

Exhibit 2:                        Joint Filing Agreement dated as of April 14, 2008, by and among Discovery Equity Partners, L.P., Discovery Group I, LLC; Daniel J. Donoghue; and Michael R. Murphy.

Exhibit 3:                        Power of Attorney of Daniel J. Donoghue, dated as of August 24, 2006.

Exhibit 4:                        Power of Attorney of Michael R. Murphy, dated as of August 24, 2006.

April 14, 2008

Date

DISCOVERY GROUP I, LLC,

for itself and as general partner of

DISCOVERY EQUITY PARTNERS, L.P.

By:  Michael R. Murphy*

Signature

Michael R. Murphy, Managing Member

Name/Title

Daniel J. Donoghue*

Signature

Daniel J. Donoghue

Name/Title

Michael R. Murphy*

Signature

Michael R. Murphy

Name/Title

*By: /s/ Robert M. McLennan

Robert M. McLennan

Attorney-in-Fact for Daniel J. Donoghue

Attorney-in-Fact for Michael R. Murphy

Exhibit 1

List of transactions by Reporting Persons in the Company’s Common Stock since the date of the most recent filing on Schedule 13D.

Exhibit 2

Joint Filing Agreement dated as of April 14, 2008, by and among Discovery Equity Partners, L.P., Discovery Group I, LLC; Daniel J. Donoghue; and Michael R. Murphy.

Exhibit 3

Power of Attorney of Daniel J. Donoghue, dated as of August 24, 2006

Exhibit 4

Power of Attorney of Michael R. Murphy, dated as of August 24, 2006