I need to buy a new coax cable to use with my HD tuner and Radio Shack indoor amplified antenna. I previously used a 25 ft RG6 cable, but I had to use that to hook up both tuners on my Directv DVR. What type is recommended, should I go with RG6 again? Also whats the max length coax and I can get away with before loss becomes too high. I would love to be able to get the antenna closer to the back window for better reception.