hi, i'm planning to buy a HDTV soon (most likely a Sharp Aquos 37" from Costco). I'm pretty clueless about HDTV. In the end I want to watch minimal cable (non HD) and then I want to get over the air Broadcasts (Digital, HD and Non HD) via an antenna. Eventually I want to dump Comcast and only get free TV and TV shows via iTunes. How many channels can i expect to get here in Boston? There seem to be quite a few according to HDTVmagazine. There seem to be lots of PBS, ABC, FOX and independents. Will they be free and will they have the same programming as the corresponding cable channels? I ask because they call themself "ABC affiliate" and I have no idea what that means. Thanks!