This is my first post, but I've been watching this thread for a while. I'm very happy there's someone on the inside at KREX watching this thread and responding.
Soccernut, I run Directv with an around the dish type amplified antenna (Terk TV44). The dish is on the top of the roof on my 2 story house, so its pretty high up without many obstructions. I live in the 31 & E 1/2 area. I have no problems picking up every available digital channel in the valley except for 5-1. Until superbowl Sunday, I have never been able to get a signal on 5-1, and the strength has been in the 0-5% area. I got 5-1 for the first time last Sunday, but the signal bounced randomly between 63 % and 0%. I would get about 5 minutes of good signal, followed by 1 minute of massive macroblocking and signal loss. This cycle continues today. Looks like 5-2 is doing the same thing.
I have several different digital tuners in the house, including a Hughs and Samsung brand Directv HD tuners, one built into a Toshiba TV, and a HP Express card digital tuner, all of which acted the same.
I tried repositioning the antenna in every conceivable position on the dish to squeeze any extra signal out, but to no avail. The best signal I can get is 63%, but it still bounces to between that and 0%
I hope that helps!