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. Other stations like this one (e.g. Manasquan Inlet NJ and Fire Island NY) do the same to pin point the mariner’s position by triangulation.

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