AN/FRD-10 Classic Bullseye Antenna

AN/FRD-10 Classic Bullseye Antenna
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By kjfitz @ 2008-07-21 23:05:32
The Naval Security Group (NAVSECGRU) worldwide CLASSIC BULLSEYE (now FLAGHOIST) network is part of the DOD Worldwide High Frequency Direction Finding System for strategic intelligence collection and emitter location. High-Frequency Direction-Finding [HF-DF, popularly known as huff-duff] intercepts and locates voice and message traffic transmitted on short-wave channels. HF-DF systems operate at frequencies where the signals are reflected from the earth's ionosphere [skywave signals].
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