Purchased for use on a 31ft powerboat with built in stereo intended to receive FM radio from 75 miles away. It has 3 wires: power, ground and antenna. DO NOT CONNECT GROUND TO GROUND OR NEGATIVE! This is for the "ground plane" of the attached antenna and power supply when I was about to connect the little black one, Zap! The antenna appears to be grounded as a red light glows when connected which gives me a small noticeable leakage current. FM not consistent beyond 75 miles, NOT recommended
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