Jim:

The corona rings I am using look something like the attached drawing.

Thank You very much.  Same basic idea.  Excellent.

I have been using as insulators for years the very heavy dense plastic
tubing (in small pieces a few inches long) as used by the gas company for
distributing natural gas.  The Decca happily chews through that stuff like
it was a hot knife through butter.

Thanks and I will try that when we pull things back in line later this
afternoon.

Larry
VA3LK