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Y'know the AM broadcast band, the noisy scratchy muffled side of your car stereo which is only suitable for talk radio and traffic advisories?

Here's a signal received across ~500 miles.

youtube.com/watch?v=YMAPKTnJtn

@rey Back in the day you could hear AM signals from all over the country. Especially on those late-night drives with the old car radios that you could fine-tune manually, it was a trip.