The introduction of digital radio has been one of the biggest innovations in recent FM broadcasting history. This radio signal can be heard at a distances of thirty five thousand kilometers and beyond.
That is more that twenty two miles with a clear reception, no static and more than one hundred stations to listen to. The inception of this concept was 1992 when the Federal Communications Commissions gave up the S band on the radio wave spectrum (2.3 GHz) to Digital Audio Radio Service. The companies that were initially given a license to broadcast on this spectrum were XM digital Radio and Sirius digital Radio. Currently, there are three digital radio services broadcasting around the world: XM and Sirius in North America and WorldSpace in Europe, Asia and Africa.