On my newly aquired 96 Thunderbird, in the trunk right next to the inertial fuel cutoff switch, there is a black cover held to the unibody by two black reuseable push pins. Under the cover is a circuit board or a silver box with a couple of boards attached to it. On the side of it is a connector that looks like an antenna connector. I pulled it out to get a better look. It certainly looks like it's for an antenna, making me think this piece of electronics is related to the radio. It only has the standard cassette tape deck. My 97 only has a tape deck as well, but it does not have this box. I'll post a picture if needed, the car is farther away than I care to walk at the moment but I figured somebody would know what this is without the picture...