I remember what you're talking about. I was in awe listening to all those foreign languages.
Crystal radio brings back fond memories. As a young boy in the 50s I had one that my Dad taught me how to build. I would fall asleep with the headphones on and my Dad would stop by on his way to bed to take them off... It was fun keeping a log of the stations and times I’d heard them. I can’t think of many kids for whom that would be entertainment these days. Life was so much simpler then...