A few months ago, there was a thread concerning coax
in underground conduit. The consensus was that it's a
bad deal, because moisture condenses inside the conduit
and the coax sits in a puddle of water.
Here's a data point that seems to show the opposite:
I've had 50 feet of "RG-8 type" buried a foot down in a
2" ABS pipe for 5 years. Yesterday I pulled it out and it
came out dry. This is in a Seattle suburb, where moisture
is abundant.
I tested the loss and it seems to be well within spec for
this type of cable.
73 Mike N6MZ
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