I just got Comcast HD yesterday, and I'm trying to figure out whether or not I should keep my Tivo service also. I got the dual tuner PVR which also records HD. Until I decide whether to cancel Tivo, I'd like to split the coaxial out of the wall and put one directly into the Tivo. Then, it could be used to record all the kids stuff that fills it up anyway. I know I won't get any pay channels, but most of the stuff we record is from basic anyway. It will use the Tivo tuner, so it won't conflict with tuning the cable box. The other coaxial would go directly into the Cable HD box. Then I'll use the PVR to tape my stuff, including HD stuff. Will the split seriously degrade my HD signal? Thanks for your help.