If you are talking about normal RG-6 cable (that includes quad shield RG-6) is simply NOT designed for component distribution. While it may work for some people, you are really increasing the odds of failure if you use this type of coaxial cable.
I initially tried to distribute composite (not even component) video in my house using the Coleman RG-6 cable that I had already run. Coleman is a decent name brand cable and I have used good compression fittings on all my connections. I could not distribute the signal even 20' to my closet TV. The picture flickered and ghosted to the point that it wasn't watchable.
Everyone on the forums tried to tell me it was my terminations (this was about 1 1/2 years ago). But there were a few out there that said it was due to the fact I was using regular RG-6 cable and not a precision coaxial cable. I followed their advice and bought the precision coaxial cable (a Coleman mini-coax because it was cheaper than the precision RG-6 size) and I get perfect signals now - either composite or component to all TV locations including some that have cable runs approaching 60'.
So please, take it from someone that has first hand experience - regular RG-6 cable is not designed for component (or even composite) video signals and may result in complete failure even at short distances. Don't try to save a couple hundred dollars and end up not getting the results you want. You do get what you paid for in these situations.