I was thinking of running S-video to my old big screen form my system downstairs system. I thought of using two coax cables for the run and wanted to know what Ohm, cable type is correct? 75Ohm? RG-6, RG-8, RG-58, /U ??? I have plugs that can mount in a wall plate ready, so I just need the cable. The run will be 15'-20'.