Thanks for the quick replies I appreciate it. My internet cable is with comcast, satellite TV is dish. Any way of knowing ahead of time if diplexers will cause interference or not, or should I just try and see? Also I already have wireless, but it's too far away I suspect. That's why I want to...

Hi. Actually I do NOT want to wire. That's why I am here. I have cable internet, comes into house on a coax. I also have satellite TV on a separate coax. Both go to different rooms. I want both going to the TV room. Can I split the tv cable to include the internet signal? This would avoid me...