Unique amongst airborne early warning aircraft, the IAI/Elta Nachshon Aitam uses two different transmission bands for its radars- L-band for the conformal side antennas and S-band for the nose and tail antennas. Utilizing a Gulfstream V airframe, the use of a different frequency band for the nose and tail antennas allows for a smaller antenna that results in less performance penalties on the overall airframe.
Source: International Air Power Review, Volume 25. "Technical Briefing: IAI/Elta Nachshon, Israel's special mission Pioneers" by Shlomo Aloni, p83-84.
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