I have an OTA in the attic that works excellent. I get a great HD signal on all of my local channels. Do I need the new dish if I want to go HD through Directv or can I use my current 3 LNB dish? I have read that the new mpeg4 channels are only HD locals. They have not been released in my area yet (St. Louis) but I figure the quality can't be any better than my OTA. Am I right? Are all of the HD channels that Directv offers right now on mpeg2 besides the locals? Are they going to put other HD channels besides the locals on the new mpeg4 satellites? Thank you in advance.