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The braced J-pole is far better than one without bracing.
5' tripods are very strong and make a premium quality foundation for virtually all OTA TV antennas.
If you have access to the attic, blocking between rafters can be added after drilling through the roof deck (it's easy to locate the blocking precisely once to hole has been drilled). Construction grade screws through the rafters into each end of the blocking will transfer load to the rafters. With bolts through each tripod foot, through the roof and deck materials and through the blocking, you'll achieve a very strong anchorage with little chance of fasteners pulling out under stress. Use pitch pads and roofing sealant (of course).
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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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