I watch network HD on DVB. I don't have a clue to where ABC HD, Fox HD, or UPN HD can be found. But, I watch CBS HD and WB HD from C-band on occasion. I have tried to watch NBC HD, I get a good signal, but it won't lock for some reason. And the same goes for PBS HD, I can't get a lock. NBC HD and PBS HD are both on ku-band. I'm one of the few with an expensive Quali-tv receiver. It does great HD, but it definitely has issues. Such as no blind scan. Also if you change the satellite it loses what you programmed in, so when you go back, you have to reprogram it. Although you can note, my DA may not know what I'm doing. And another thing, I've found out that they do updates over the satellite. All I have to do is point it to Astra 1 at 18-19 degrees east and put it on the correct channel and let it do it's thing. My only problem is I can't see that far over the hill. No telling what improvements I might be missing.
Al