RG6 is more of a size class than a specific performance spec, but each of the major manufacturers have an RG6 class cable. Proper labelling and quality termination is hugely important. 9 out of ten times, when I rig a venue, it's easier to pull our own in that deal with and troubleshoot the unknown installed stuff, even if it runs to and from the perfect spots! If you can, pull some Single Mode fibre in. The cable and the termination is cheap, the kit on the ends is more expensive, but you do gain future proofing. Getting 4k long distances over coax is a real pain. Network infrastructure thought about too?