The following problem with my HR20, that I am going to describe, will probably not be believed by most of you, but it does happen. I live in the Chico-Redding, CA, DMA. The local cannels here are not in HD off of the D* sats. Chico and Redding are 70 miles apart.
Two of the channels, ABC and PBS, are broadcast from Redding. Two of the channels, FOX and CBS, are broadcast from Chico. One channel, NBC, is in between but closer to Chico. Three of the channels have decided that they can broadcast the same logical channel numbers on two frequencies, to get better coverage. Channel 7-1, ABC, is broadcast on 34 and 7 with 7 being the weaker of the two. Channel 9-1, PBS, is broadcast on 9 and 18 with 18 being the weaker of the two. Channel 12-1, CBS, is broadcast on 43 and 36 with 36 being the weaker of the two.
When the channels are synced, they show very strong signal strength. However, when watching a channel that is broadcast on two frequencies, the picture often pixilates and drops out. There is no way of telling, on the HR20, which channel is actually synced. I can switch my viewing to the tuner in the TV and see what's going on. The HR20 is synced to the weaker of the two signals, even when the signal strength shows 100%.