I have this unit installed on my hdtv and a non hd unit installed on my non hdtv. I am using the latest 18 x 24 3LNB dish. It was all supposedly professionally installed by Circuit City. The problem is when using the Zenith all my signal strengths are much lower than that on the non hdtv when viewing signal strengths on that set. For example on my hdtv Sat C transponder 8 is usually around 55 and on my non hdtv it is around 80. When I switched both direct units with each other the low signal followed to the other tv and on the hdtv with the non hd box the signal strength went up to around in the 80's. Called Directv and they felt since the problem followed the hdtv receiver that it was a bad receiver. Took back to Circuit City and exchanged it and still the same problem. Called Zenith and they were clueless. I have had them come out and realign my dish with no change I get great signal strengths on my non hdtv. Is it possible the the Zenith handles the signal different and that is why I see less signal strength or could it be another software bug in that the signal is really good but the graphical interface is not showing it. I hate to exchange it again especially if it is not going to help. I live in Michigan south of Detroit. Also I have a great line of sight for the dish. Any ideas would be greatly appreciated. I did purchase a 3yr total protection plan on everything from Circuit City. Thanks again for any feedback and Sorry for the long post.