Given the signal power levels in the air, I doubt you would need two amplifiers. Rule of thumb: One amplifier can be too many, two is almost always too many. If you are starting with weak signals and have some long runs of cable and are splitting many ways, then a second amp may be needed.
I've been presuming this is an attic install. So that's why I've been suggesting a distribution amplifier (which is not designed to be outside in the weather).
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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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