Last month I purchased a TV with a built in NTSC and ATSC digital tuner, and after I brought the TV home, I hooked it up to my cable service (Cox). I noticed immediately that I was only receiving some digital channels but not high definition channels. I sent an email to Cox customer care about the lack of HD programming, and their response was, "You need to upgrade to our Premium service to receive HD".

My question is: Why do I need a set top box to receive high definition channels, why don't I receive them through the basic cable package I have with Cox, an why did I spend so much money on a brand new TV if I can't get High Def!