I have a 1988 f150 and the stereo that was in it would not pick up FM stations. I installed a pioneer cd player in its place and tested the radio out and I can not pick up Fm stations still. I had a marine stereo antenna handy and pluged it into the stereo and still no radio stations. does anyone have any sugestions. ive been through 2 stereos and two different antennas.Fyi the cd player works fine.