use the existing rg-6 QS cable that I'm currently running to my dish & run a diplexer to connect an OTA antenna for local HDTV reception? My father-in-law gave me the clip-on terk antenna for Christmas that attaches to the dish, but it's not strong enough. I live about 25 miles from the antennas, and am thinking about getting the Channel Master 4228, because I live on the other side of a pretty large "mountain". I've been using a radio shack double-bow tie antenna, and have been able to get NBC, CBS, PBS - but the wife doesn't particularly like the cable being run across the floor & out the door. I just ran a separate RG-6 cable in my attic - thinking that if I could receive reception on ground level outside, then it would surely work in my attic. I purchased a LARGE VHF/UHF/FM antenna from Radio Shack to just see if it was possible - didn't get anything. I would much rather use my current cable coming from my dish if AT ALL possible - is it? Any help would be much appreciated. Thanks!!