Satellite Radio is a product of companies such as Syrius or XM. When using their pay per month receiver, you can get a large number of different stations, most or all without commercials. Rather than being broadcast locally, the signals actually are sent from a transmitter in orbit over the earth.
Many radio personalities, including Howard Stern have moved to this medium because there are many fewer restictions on what can be said or done. The rules of over the air obscenity do not (at least for now) in the same way that they do for standard AM or FM radio.