Numbers stations are shortwave radio stations of uncertain origin. They generally broadcast voices reading streams of numbers, words, letters (sometimes using a phonetic alphabet), tunes or morse code. Spy broadcasts? Alien communications? Who knows!? Wikipedia VIDEO->
Here’s more if you’re interested: http://www.damninteresting.com/?p=570
I found that video very intriguing. It inspires me to look into the “numbers” stations more. Kind of creepy right?