said by CCarson:
Put a TV tuner card in your pc, upgrade to a newish video card, and set up Windows Media Center. Presto-free digital HD and a DVR. Plus you get the capability for burning DVDs of anything you record. If you have to watch something that's not available over the air, Netflix and hulu can fill the gap.
you dont know what the heck you are talking about.. comcast scrambles 95% of their channels even local hd channels so you dont get squat this way.