Thank you Bob! It looks like you have the same thing with your HD Homerun that I have with my Tivo. I am receiving a strong antenna signal too. In addition to those steady white lines at the top there is some additional constant flickering, which to me really makes the whole picture unwatchable. I wonder if it looks this way to local cable subscribers as well?99% of the time, 2.1 is perfect ... mainly noticeable on full screen graphics seen usually on sports games when transitioning between one camera view and another, like after they show an instant replay. It just started recently, I would have definitely noticed it before.
Here is your 39.2 screenshot ... It is taken directly from the HD Homerun viewer with a really strong signal:
This is a fairly popular channel with its classic sitcom lineup, if this is happening for the whole Houston area then it's surprising not enough people have noticed or complained to try to have it fixed. I wasn't sure if I didn't have something set up right, or if the problem was caused by the Tivo, but it seems it's a problem with the local broadcaster? Considering just about every other station is coming through fine! (Except Light TV on 26.2 which looks similar but not nearly as bad.)
Bob I think what I've mostly seen is pixelation in general on a lot of stations but not too much recent macroblocking that I can remember. As I said I don't watch 2.1 as much but I'll be on lookout.