when i bought my car the antenna was frozen about 1/4 of the way up (the girl i got it from lived on the ocean). So basically it was corroded.
So i picked up a new antenna from a local shop, and installed a new one. It's pretty easy just undo the plate, and then under the dash you need to look for the antenna wires, unplug it, and then floss the new one throguh. Or you could do as pdiggs said and just get a block off plate.
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