If I was an electrical, not chemical, engineer, I probably could come up with some type of simple AM antenna, but I guess you're better off calling those redi people and ask them.
I'm familiar with autos for over 60 years but post war.
All you really need for an AM antenna is a length of wire so it could be "hidden" easily, if you know what to do. eg:
https://news.ccrane.com/2018/04/09/how-to-make-a-simple-powerful-am-loop-antenna-for-free/ Yes, good one JWL. They later put "condensers" aka capacitors on the generators for noise. I didn't mention that. I'm guessing somewhere someone has a post or video on reducing engine interference, but not sure. I would guess the proper shielding of the radio would eliminate that, but it's tubes, tubes generate heat so that has to be accounted for.
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