Comtech Telecommunications (CMTL) 10-Q 2017 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Comtech Telecommunications Corp. (the “Company”) on Form 10-Q for the period ended April 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Fred Kornberg, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

1. The Report fully complies with requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: June 7, 2017

/s/ Fred Kornberg

Fred Kornberg

Chairman of the Board

Chief Executive Officer and President