Hi.
Well Joey, troubleshooting 101 suggests trying the following ( only one at a time), in the order dictated by your available resources:
- swap in another stock unit from a friend, wreckers, etc, to check if it's the unit or the wiring.
- Does the CD/tape (not sure of your model) work? Or, is there plenty of volume on the static? Chances are, it's the tuner section.
- Connect another standalone antenna to check that entire subsystem - cable included.
- Find someone with one of those wireless FM transmitters; connect a music source & place that near the existing antenna - if you can tune it in properly, it's indicative of a weak tuner section (provided you already did the check above), since the proximity & the power of the transmitter output is providing the stongest possible signal...
Repair is not economical if it's the unit IMHO. If it is fried, go with a 'recycled' unit or take the opportunity to upgrade the head unit

.
Good luck
Cheers
Grog