I am in the process of installing a CATV(comcast) broadband connection. I have 3 TV's currently on the cable which were installed in the house upon construction. The runs are about 50', 50' and 30'. They are on what looks like builders grace COAX. I hooked them up with a 5 jack (1 in 3 out and one unused)splitter from Radio Shack and all was fine. I just ran about 50' of quad insulated coax from the open splitter port to where my cable modem will be and 2 of the the 2 TV sets with the 50' runshad noticible deterioration of the picture(some wavy lines, some fuzziness or snow). I tried switching the lines around on the splitter and it got a little better, but still not as it used to be. I also hooked a TV to the line which will serve the modem to check the signal and it was ok, but not great. Suggestions appreciated . Thanks
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