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Do you think that is enough, or should I look at alternate methods.
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I can't see how it is mounted to the roof, and I don't have enough experience to give you a reliable answer. Alternatives would be a tripod mount for the roof or a ground mounted mast fastened to the eave and side of the house with wall brackets. The tripod mount should have careful waterproofing where the screws penetrate the roof to prevent leaks; a roofers job.
Code:
Ant > preamp > coax > grounding > coax > power > TV
block \ inserter
\
10 gauge wire >
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house electrical system ground
/
mast > 10 gauge wire >
Quote:
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Will the 7777 continue the ground to the antenna?
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The coax shield between the antenna and the preamp will be a continuous ground connection down to the grounding block, which is connected to the house electrical system ground with 10 gauge wire. The boom clamp of the antenna will make contact with the mast, and the 10 gauge wire from the mast will be connected to the house electrical system ground.
Please keep in mind that I am not an electrician. The local electrical inspector, who is called the AHJ (authority having jurisdiction) has the final say.