I’m no expert on this and I’m sure someone on this forum is more qualified but I thought it applied to both am and fm. I have a Sony portable am radio, which I never use, and pretty sure that has a dx / loc button. I think it stops interference from strong stations interfering when trying to tune or listen to more distant stations. AM is extremely temperamental and can depend on the weather when try I get to tune distant stations, I believe !!!!
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