 The Westinghouse radar antenna was going to be used by whichever company won the radar competition, since Westinghouse had pioneered in the design of high-power RF phase-shifters, which are used to both focus the RF into a pencil beam, and scan electronically for altitude determination.Boeing initially proposed a purpose-built aircraft, but tests indicated it would not outperform the already-operational 707, so the latter was chosen instead.To increase endurance, this design was to be powered by eight General Electric TF34s.