Stop in for a cup of coffee

Got ahold of an FM converter for the AM radio that came out of a 74 Dart Swinger.

That was pretty cool to have at the time.

That was a big jump from AM to FM.
Lol had a few of them. Grab them when I see them at the junkyard usually sell fast also.
Was there a difference in AM and FM antennas used in Mopars? Wondering if different would improve reception on Duster that had AM only originally.