check this for more infoOn February 17, 2009 the era of analog broadcast television in the United States will end as the nation completes its transition to an all-digital system. While this change will mark the end of the traditional analog method of broadcasting over-the-air television, it wont signal the end of free broadcast television, and your favorite broadcast programs and local television stations will still be available.
Consumers that subscribe to a "pay" television service such as cable and satellite arent likely to be affected by the switch, but if you currently receive analog television over the air or via an antenna, youll need to take action to continue watching your favorite stations
http://www.dtvtransition.org/
