I just remembered that long long ago I used to listen to Knebel on a cristal set. You could sometimes pick up stations from far away.
I once had a solar powered Zenith that picked up a New Orleans Jazz game when I was all the way up in either Washington DC or Pittsburgh.
I remember as a kid the magic of nighttime radio. In the 60's it was all AM, at least for me. I don't recall the details (surely there are many radio experts here who can give us the particulars), but in the 60's and maybe even today there were FCC rules which restricted the broadcast strength of radio stations in certain markets. But at sundown the handcuffs came off as I recall, and stations that were tiny and low-powered in the day suddenly boomed out hits across half the continental US. Also, some radio stations were only licensed for daytime operation; so at sundown their signal disappeared from local airwaves, which made way for weaker but listenable signals from faraway monsters.
There was WLS and WGN out of Chicago; WSM in Nashville, the "Grand Ol' Opry" station; WLW out of Cincinnati; KMOX from St. Louis; WCCO in Minneapolis; and the "underground" border station, XERB. "The X", was where "Wolfman Jack" came from. It had studios in California, but its signal actually came from Mexico and IIRC was a monster 100,000 watts. It seems like XERB had some connection to Del Rio Texas, but that just might be me crossing wires with Wolfman Jack or ZZ Top, which memorialized XERB in their song "I Heard It On The X"
https://www.youtube.com/watch?v=tSIwVFxk0jA. (Oh my, when I think of ZZ Top's "Rio Grande Mud" and "Tres Hombres" albums, I have to wonder just who the
hell was playing music like that in 1975?! Original, amazing music.)
I also heard some of the great baseball broadcasters such as Harry Caray, Red Barber, Jack Buck, even Mel Allen sometimes. I can remember when I spent the night with my grandparents, I could hear the faint mumble of a baseball game hundreds of miles away as my grandfather went to sleep listening to the Reds or Cardinals. Such faraway radio in the night was indeed magic.