Picture quality using only a Tivo HD with cable card & tuning adapter works without issue if that is all that is connected. Channel meter lists the various channels at 80 something. However, I also have a cable modem and a thingy for cable telephone service. If I use the splitter they installed, the Tivo signal meter can go down to the 40's, and the picture can become tiled and break up. Not always but enough for it to be annoying. Obviously, the internet connections drops too often when the signal is this low. I have another cable line on another floor and the signal loss is a little better. Channel meter might go to the 40's as well when split, but at least the picture does not break up as often. Hence the question: How can I mimimize signal loss so that I can use the line for both tv and modem/telephone? I would be happy with one line getting tv + cable modem, while the other line gets the tv + telephone adapter. Am I going to have get the cable company to install a line for each device? Thanks for reading this and for any advice that you can give me.