Digital quality RG6 coax terminated with RCA plugs should be fine. PF100 or WF100 would be better over long distances (over 20m). PF100 isn't strictly speaking a grade of cable, simply a brand associated with higher quality. The same goes for WF cables. PF is foam filled and better for use outdoors because it prevents water from running along the air spaces found within some cheaper RG6 cables.