Are the antennas any good???

[jd21476]

I just installed my Alpine stereo in my 73 and hooked up the antenna wire I found under the dash. The reception for the radio was not great and would cut in and out. I stopped for gas and when I restarted the truck the tuner was just static. The antenna was still plugged in and everything else on the stereo worked.....CD, Bluetooth, etc.

Since I don't see an external antenna I can only assume it is in the front windshield. Anything else I need to check?
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