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RG6 with ground is generally sold in bulk, not in ready-to-use packages of different lengths. We only stock pre-assembled coax assemblies. It is rare that quad shield RG6 is actually needed in an antenna installation.

The ground connection at the mast can be made by scraping a bit of paint off the surface under one of the mounting bolt heads, connecting the wire under that bolt head, then hitting it with some Rustoleum to keep it from corroding. The other end of the ground wire should be connected in accordance with local or national electrical codes.

It's never a given that a near-by strike will take out a mast-mounted amp. Just recognize that there are inherent risks to putting sensitive electronics up in the air. In any event, your TVFool suggests that a pre-amplifier is ill-advised.