It comes from the temp. change especially during large ground temp.
changes due to warm,cold fronts etc.
If it was very deep it might not condense but it has to bring cables to
the surface into an area where the ground temps vary.
My long run to the HyTower follows the terain. In a low spot I drilled a
few 1/8'' holes in the bottom of the plastic EMT. Put rocks or something
in to keep the leaking moisture from making mud which will clog the
holes.
K9IL
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