Church Keys, Floor starters, Car radios only received AM...
Oh yeah! And when the FM Converter came out...woohoo!
Car radios only received AM
And if thanksgiving morning you went duck hunting with the uncles and cousins and one person (my brother) decided to go back and sit in the car and listen to that AM radio, the car battery would/did died in 30 minutes.
Plus it took the radio a few seconds to get warmed up before you got any sound. An uncle bought a new car one year that had a transistor radio - instant sound when you turned it on. We youngsters were amazed.