[tom.seeger]

I hate to sound like a broken record, but could you try making a small FM dipole to pin on the wall behind the radio? You just need 6 or 7 feet of line cord split at the end to make a 56 inch dipole. It may be all the radio needs.
I have restored a dozen 1950s FM radios, the ones with built in antennas just don't work as well as with a small external antenna.