AN/FRD-10 Classic Bullseye Antenna

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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