I have little or no signal on my HD DVR (HR22-100) on the channels listed above. There may be others involved that I haven't noticed. They come in fine on my daughter's SD receiver. Weather is not an issue. Nothing blocking the dish. All cables are tight and the signal is lost on input 1 & 2 alike. Signal strength tests fine (90+) except on transponders 4, 18 and 28 which are all 0. Any ideas? This is very frustrating.