I agree that the signal is strong. I have a 622 and 722 with all four tuners modulating. I get a clear picture on every TV, and didn't have to use an amp.
I have TV1/TV2 from the 722 in my family room diplexed back to the main cable feed via the same RG6 that carries the sat feed. The 622 in the bedroom goes to the cable junction box in the center of the house, where it is joined with the signal coming from the 722.
With this setup I get a great picture on all of the other TVs in the house. The installer was a friend and he gave me 2 extra UHF Pro remotes to keep in the other rooms, for a total of 6 remotes. (There is only three of us in the house so 4 tuners is more than enough--for us.)
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Mike