 At altitudes above , the J60s generated about of thrust each and increased the maximum altitude of the RB-57F by .To perform their Pakistani mission, the two prototypes were equipped with high-gain phased array antennas in their wingtips, an extended radome, and a canister package developed by HRB-Singer known as "System 365" installed in the bomb bay.The size of two 55-gallon drums, System 365 was a semi-automatic signal collection system that used 12 continuously scanning receivers and had a manual fixed-frequency coverage capability with pre-selected frequencies.