KBa wrote:
Hi all

Problem exists how to get reliable insulation to split driven element
and support rod which is exposed to RF voltage ?
Fiberglass is told to be sensitive creating conductive coal brigdes
which creates true resistive short at driving point ? (at least one
fiberglass tubing is done so... gap was 2 inches )

How to improve insulation ? Ptfe-shield over fiberglass rod, heat shrink
tubing, varnish layer ?

tnx oh6io

Such a problem is going to come from one of two things:

Too much power for too little separtion and arcing; use wider spacing and
less power.

Accumulated filth and moisture leading to leakage leading to carbonization;
heat shrink tubing or tape like Coax-Seal to keep the path clean and dry.