Have you ever seen your grandpa's old radio that had a "SW" option on it? Probably not, but if you did see one, you probably wondered "What is that about?". Well, that stands for shortwave radio, a special type of radio that is just above the AM band, yet way below the FM band.
Now you might be asking, "Okay, whats so cool about that?". Well, shortwave radio contains many strange and abnormal signals that you would not usually hear on a normal radio. Shortwave signals can also go WAY farther than FM, literally sometimes around the world.
These signals include, but are not limited to:
To recive these signals, you will need a shortwave radio(no duh). You can get a decent one for about 40 bucks on Amazon or something.
Alternatively, you can go on a WebSDR, a radio that can recieve shortwave radio on the web.