If you can receive the mjor networks ABC NBC FOX CBS you possible can pick up the Digital versions of those channels with an ATSC tuner that is built into most HDTVs sold today, and a roof antenna.
satellite provider that provide hd channels...packages..ex. dish network, direct tv...if you live in the united states...if you live in canada, I do believe it's call bell expressvu...and the hd signal is beaming from satellite 82(nimiq2 i'd believe).