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If your antenna is in the attic, it won't receive much if any signal once the roof is covered in metal.
A common J pole used to mount small satellite dishes is too short. An OTA antenna mounted that close to a metal roof is going to be de-tuned by the close coupling to the metal. The results will be unpredictable, but usually less satisfactory than before the metal roof was installed.
Generally, the higher the better. Try for 6' or more. The metal will reflect signal, which could cause multipath symptoms. Those effects will be less as you increase the space between the antenna and other metal. The antenna should not be pointing at nearby metal.
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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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