I have a similar question. Two years ago I switched to Dish because Comcast cannot provide me a DVR that has any decent features -- this will likely NOT change in the near future. I had Dish installed and LOVE my 722 DVR -- I would never go back if I can't get a DVR similar to the 722 from Comcast. I kept Comcast wired to my house for the high speed internet; I have it going to just one jack in the house that the cable modem is connected to.
I have the output of my ViP722DVR-HD set to TV1: TV ch out 110, TV2: TV ch out 115; the output of my Vip222K-HD set to TV1: TV ch out 120, TV2: TV ch out 125. I have the Output of both units (722 and 222) as Inputs to a high quality splitter [3 Inputs/1 Output], the Output of which goes into the Input of another high quality splitter [1 Input/8 Outputs]. ALL 8 of my TVs in the house are feed from this splitter via individual coax cables. It works GREAT!!! I can see any of the 4 Dish signals, and anything recorded on the DVR on ANY TV in the house. I would NEVER go back!
Our community has 3 channels that have information produced by our local newspaper. These three channels are ONLY available on Comcast -- NOT over the air or on ANY other provider. My wife really wants those channels. In addition, it would be nice to have the basic local channels if Dish goes out (happens about once a month). Comcast has a current promotion for Basic cable (channels 2 - 22) for $10 per month. I had them put that back on my account. I then split the Comcast feed into two - the one that goes to the cable modem and the other as the third Input to the splitter that the Dish signals come into. Same thing as reported earlier -- the signals to ALL TVs on ch 110,115,120 and 125 are now fuzzy. I took the Comcast signal back off the splitter.
Most of my TVs do not have more than one coax input so even if I could wire a second cable to each set, I would need a switch to get both signals into the TVs.
Any suggestions as to what else I can do? I thought that using ch 110, 115, 120 and 125 would help, but it is not working with the Comcast signal. Thanks!!!