I've never tried this, but I found it so I thought I'd share it:

Clear-Cast is no cable or satellite TV. All the channels received with Clear-Cast are absolutely free with no service contract, no equipment to lease and absolutely no monthly bills. Clear-Cast is being released by zip code to areas in which free over-the-air digital signals are broadcast so residents of those ares can get free TV. Clear-Cast's advanced design will not receive cable or satellite channels and is engineered to pull in channels being broadcast for free to eliminate cable and satellite bills. Trademarks and program names above are the property of their respective owners and are not affiliated with or endorsing the Clear-Cast. Offer not available to MA & CA residents

The information is comes from the newpapers.

Get TV with Clear-Cast: if you find the first two digits of your zip code immediately call 1-888-898-6615