You can adjust the antenna to 31" which should be optimum for FM. There might still be something wrong with the antenna but perhaps the radio is bad? Can you bench test it and get it to work? Just a short piece of stiff wire stuffed in the antenna jack should get some FM stations if there are any around you.

-Ed

Ed Fallon
In seemlingily endless process of restoring a stock 1953 chev 3100 pickup.