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Join Date: Nov 2005
Location: West of Mt Diablo
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Quad shielded coax is normally used for CATV signals which is just what you are going to do; extend the cable service to a new outlet. However Q-S cable is not the best coax in terms of shielding. It is also more difficult to terminate because aluminized mylar foil is fragile.
The cable company may use a water proof, foil shielded, copper plated steel center conductor w/ weather proof connectors. It is good enough cable, not the best cable, and you won't bury yours.
RG6 is not even inherently superior to RG59 in all applications, but it is becoming the defacto cable industry standard.
The most usual cause of problems is not the cable itself but the connections. Make sure that all are tight or even replace them. Do not use twist on F connectors. Use crimp style with or without gold coloring.
Spend a little time in the info sections of the cable makers' and vendors' web sites. I think that you will find that hight coverage copper or copper and foil shielding is better for your application. Do not overlook just buying a length of pre-terminated RG6. If it is a little long a you can coil up the excess.
The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd.