I’ve done a few DTV upgrades in apartment buildings. In my opinion, it’s very difficult to distribute, in some buildings you’re very lucky to have good signal in 12+ floors, while in others you can’t even get the signal to go down 3 floors!! It’s very frustrating when you have older people breathing down your neck cause they can’t watch there news, and its always the channels that they love that are missing, go figure!
I believe it has to do with the quality of wire that was ran through the building. If the wire is in good shape so are you! When one T.V. has all channels and the others don’t, try changing the splitters, the UHF/DTV signals operate at a higher frequencies than most splitters don’t handle. If you still don’t have all channels try the line, and if it still doesn’t work RUN!!!!