[mikethedruid]

In answer to your question about the FM antenna hookup. The original used the plug you have, but someone changed it. The removed the original antenna, which uses the line cord as an antenna by capacitive coupling, and replaced it with 300 ohm twin lead. It looks like one of those standard FM antennas they used to use with stereo tuners. The original used a 19 inch length of 18 gauge wire soldered into the upper left hand pin of the plug, looking from the back with the plug in the socket. The other end of the wire is soldered to a metal tab about 1 inch by 1 inch, which is then insulated on the outside and wraps around the line cord. You slide it back and forth on the line cord until you hit a "sweet spot" where it receives the best. It looks like this. ( I took this picture when I had put the antenna on the new line cord I installed on the radio.)
[Image: https://64.media.tumblr.com/3a0bd4704bbf...62fe36.jpg]

Here is an under chassis picture of my 48-482 chassis all finished.
[Image: https://64.media.tumblr.com/50d40fb2e82f...cec1be.jpg]