Gunner Asch fired this volley in
:

What do you suggest for this application?

RG8 is the better choice of the two. It's usually foam-core, and low-loss.
It's also got a little faster (lower) velocity factor than RG58, making it
lower-loss over a given length of run.

Ham radio rule-of-thumb: Even with cheap, homebrew antennae, NEVER skip on
the feed-line. Use the best you can afford, because most of your operating
power losses are there, not in the antenna.

LLoyd