I have no qualms about installing a Ronard #811 5' tripod on my roof. Use the correct size bolts, into rafters or backing blocks, and use sealant that's compatible with the type roofing material you're mounting to. (Silicone type caulking is incompatible with asphalt roofing materials.) When held securely and sealed correctly, the installation will outlive the roofing material.
Any motion of the base on the roofing material during windy events will do damage to the roof. Any damming of water will put you at risk of water backing up under shingle tabs. I'm not convinced you would be at lower risk using a non-penetrating mount
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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