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Autodidactic user
Join Date: May 2003
Location: Summerfield, NC
Posts: 1,298
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Years and years ago (mid-70s) I added an "antenna amplifier" to my Mustang that looked like that. It was supposed to amplify the FM signal when you pushed it in. Since your car is of similar vintage I'd check to see if it is connected to the stereo and/or antenna. When you trace the wires, let us know what you discover.
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