ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Whats a Better Coax For CCTV Applications

Hi Everyone,
I have recently taken on a CCTV job and i was wondering if using RG6 Quad Shielded 18AWG cable is the best to use. Is there any disadvantages to using such a high quality cable. I was told RG59/U is the way to go, but i've also heard that it has losses over a 20 metre run. Anybody's help will be much appreciated.