So, I've read a number of people here and elsewhere say that if you have an MPEG4 capable receiver that you can't diplex the signal with an OTA antenna and get both the local stations OTA and via satellite. But, in practice this has worked just fine for me -- The D* installer came back yesterday and installer an OTA antenna on the roof, and ran a 3rd line for me so I could support both a D* TIVO and an H20, and he used a diplexer on both ends (at the 6x8 Multiswitch location and right before the box) ... And everything works correctly. I can watch my HD Locals OTA and I can watch them in MPEG4 off of the Satellite. There doesn't seem to be any noticeable loss in quality either. The antenna they installed was an Eagle Aspen UHF antenna which said it was specifically for HDTV, and they used an Eagle Aspen diplexer which reads: 950-2250 (SAT SIDE) / 40-860 (TV SIDE) Mhz... I decided to move the line with the diplexer on it to the D* Tivo just to be safe, but there was no difference in quality. Am I just crazy or does this work?