I had RG58 in 'moisture' for a decade: in fact 70 metres at the bottom
of a pond! Everybody said, that it won't work, but I didn't notice any
problems. But I had them on the part, which was on the ground: hares bit
it broke and 3 years ago I replaced it with a better one: Tri-Lan RF240.
It wasn't cheap for almost 300 metres feed, but I think it will last as
long as ... Now I buried it carefully a few cm also on the ground. I
think all is well as long as the shield doesn't get breaks.
Getting a length of coax inside a garden hose isn't as easy as it may
sound, I tried. Some length goes easy, but in the end one needs to put
first a string with air pressure. I am glad, that I didn't take the trouble.

Best regards,
Mauno
Nick Hall-Patch kirjoitti 28.1.2019 klo 6:06:
Haven't seen any response to this, James, and am probably not going to 
be much help.
I've just used RG58 variants for up to 100' in permanent installations 
around the yard, 10 to15 years in some cases.ÂÂ One of them runs 
through about 70' of rigid PVC electrical conduit IPEX #032907 and is 
buried.ÂÂ Mind you, I've heard that although such conduit will keep 
the groundwater away from the coax, water vapor will condense inside, 
leading to a wet interior anyway. That coax still seems to work,so 
maybe it's dry...or maybe not.
On DXpeditions, I've run over 500' of RG58 coax to DKaz'es and such, 
and not suffered particularly.
best wishes,
Nick

At 22:26 2019-01-27, James Niven wrote:

I am curious as to what type of coax everyone uses for DKAZ antennas and
also general international shortwave band listening dipoles?
It's time to revamp my antennas and I want to use the right cable 
that will

last for a while.
I have read that RG-8U is good for long runs of a 100 to 150 feet, 
and if I

was to bury my coax, which is the best pipe/conduit to use to bring my
cables into the shack?
thanks
James Niven
Austin, Texas