Terrestrial radio?

As I was reading an article about the problems with advertising radio stations were having and how one of the advantages of satellite radios is that it is commercial free, I came across traditional radio being called "terrestrial radio" -- it shows you how little I've paid attention to the discussion concerning satellite radio, since I'd never heard that term used before. It's used to denote radio broadcasted from towers on the surface of the planet as opposed to satellite radio which I guess we could call, "extraterrestrial" -- I'm not even going to hazard a guess as to what we should then call internet streamed radio...