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Sounds like to me you have burned it up with your vhf or cb radio. Contact garmin before your warranty goes out. U cant talk over 5 watts and keep your antenna's atleast 3 feet apart. Hope this helps.
what antenna did u get a long range or the little spiral one? Just because little spiral ones we had problems when plugged in gps the coax pushes out of connection so when screwed in gps we pushed down on coax also