Hotrod57, I had a hidden attenna between the headliner & roof of my '32 {fiberglass} & it didn't work very good. I don't know what make it was but it was a little black box with a power wire to it. I went to the local stereo shop & they said the only way to get good reseption is to use an antenna that extends above the roof of the car. I didn't want this so I then put a regular antenna inside my car running parallel to the roof of the car. It comes out of the side of my above mounted stereo & is above the windshield on the inside. You can only see it if your in the drivers seat. This works better than the hidden attenna but still not very good. Hopefully someone will 'chime' in here with a better idea! Bill