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Preamplifiers are powered by low voltage. The amplifier unit is mounted outdoors on the mast with the antenna. The power is provided by a unit located indoors, protected from the weather. The coax cable between the outdoor unit and indoor power supply provides the path for the signal into the house, and the path for the low voltage power supply out to the preamplifier unit.
There is no need to deal with 120 VAC outdoors.
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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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