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AM radio law opposed by tech and auto industries is close to passing | Ars Technica
(arstechnica.com)
this post was submitted on 02 May 2024
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I doubt the wavelength is a factor there; depending on the circumstances it could be anything from atmospheric waves to something in your car causing intermittent interference.
The Earth's ionosphere exists in several layers. During the day, solar radiation ionizes gas deeper into the ionosphere causing a layer that doesn't usefully refract most radio waves; you can reach beyond the horizon on some of the higher HF bands, but down in the MF, you've basically got ground wave. At night, without the sun around to cook the atmosphere, that lower level dissipates, revealing a higher ever-present layer, and the geometry is right to refract signals for hundreds or even thousands of miles.
Skywave propagation can be really fun to play with.
That truck was a old fucker. It had AM and a 8 track. So I wouldn't be surprised if the radio shielding was limited and degraded..
There likely was no "shielding" in a truck of that era, just simply the truck was made of metal as was the chassis of the radio, bolt 'em together and you've got a reasonable ground.
But, I do know from experience that there are items on a pickup truck that can produce radio interference especially when worn. A worn distributor is a spark gap transmitter, as I learned when I installed a mobile radio in my S10. The audio on my radio got a lot better after a good service of the ignition system.