I have a 97 Sunbird Spirit 150 bow rider with what appears to be an original (Audiovox?) dash mount cassette/fm head unit. It appears to just have quit as I cannot get any sound out of it. I was wondering if anyone knew where exactly the FM antenna was located on this/or similar boats. There is no obvious antenna. It does not appear to be in the windshield either. Is it the navigational mast that plugs into the starboard stern side?