My parents 3rd car - a 1965 Ford Custom 500 didn't have a radio and one was never put in, once, I bought a cheap battery powered AM radio to try inside the car while traveling through KS on I-70 in 1976.
I found that if the AM radio was placed on the shelf behind the back seat near the back window, reception was fairly good.
It occurred to me a little while ago that a battery powered pocket AM radio with an antenna input and an AM antenna that has a very thin portion that could go from inside the car to outside the car with the window fully rolled up [above link indicates that this tech exists and could probably be adapted to work for the AM frequency band] could be a way to offer AM reception in cars that don't not have an AM radio.
Kirk Bayne
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