I had the same type of deal as you. The thing that helped my picture quality, etc. is putting in an amplifier. It is a small silver box that you run a cable in to. Mine then has 4 out terminals to run the cable out of. (Like a 4 way splitter). Make sure you get the kind that plugs in though. Anything else is junk. You can get them at Radio Shack or Best Buy.
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