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You probably don't remember these but I have a question
(lemmy.world)
This is a most excellent place for technology news and articles.
Had this for old portable CD players (the kind that would skip when the car hit a bump). They don't work all that well. Even if you find a frequency not in use, it gets interrupted from time to time as you're driving around.
But the alternative is nothing.
I used one all the time in my last work van. Drove it over a good chunk of the US and interference was rarely a problem. You just need to pick a couple unpopular frequencies right next to eat other and set those as two of your radio station defaults. It's slightly annoying but it rarely even happens.