RG-59 will even work for HDTV. The issue is not the frequency capability of the cable.

HDTV is a digital signal sent over a certain frequency, in most systems... this will be digital channel 80, which roams around in the 597MHz spectrum. RG-6 is ALWAYS the way to go if you have the chance to wire with it, never use RG-59... but it will still work just fine.

So to respond: RG-6 is perfectly fine, I'd use RG-6 trishield, belden works fine... I prefer commscope. Quadshield is a better cable physically, and has more ingress prevention.

Same goes for cable modems, etc.