USCG Cape May NJ

Doppler VHF-Marine Radio Direction Finder (RDF) over 150 ft tall tower. This “network” of RDF antenna stations up and down the coast can triangulate a VHF transmitter’s location many miles away.
You are looking at multiple vertical dipoles arranged in a circle; they virtually “spin” around in a circle (electronically) using solid state switching. Using the Doppler Effect they can then get a line of position to the mariner’s transmitter. A second station like this one (e.g. Fire Island NY) does the same to pin point the mariner’s position by triangulation.

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