Yes, check what Cameljoe said. That is the most common cause of radio loss in TJ's. If you did actually damage the end, your best bet would be to go to Best Buy or a local car audio shop and purchase an antenna extension, two feet will be plenty long. Take your glovebox out and look for the antenna junction; the antenna wire is a thick black cable, usually wrapped in foam tape. Remove the end that goes to your radio, and replace it with the extension you bought.