I have the RCA with the HDTV decoder built into the TV. I used to have Directv but I now have Adelphia cable service which does not brodcast in HDTV at all. Duh. Most dont. But, what I need to know is this.... If CBS broadcasts a program in HDTV, does Adelphia have to carry that feed through to me to be able to get it in HDTV? If they don't carry the feed, how can I get HDTV on my TV? Do I have to buy a converter even though I have the decoder? And finally, do I have to use the RGB connectors if I want to get it in HDTV or can I just connect the cable to the back of my TV? Thanks for any help I can get.