Lots of kinds of "glass" out there.

fused silica is pretty low loss
borosilicate glass (e.g. Pyrex, Kimax, etc.) is medium
windowglass (soda lime) is all over the place.- Hide quoted text -

Exactly... If I were serious about using my capacitor design for the
higher bands I would either redesign the circuit to increase the plate
area or go to borosilicate glass...
My 80 - 160 remote tuners are working like gangbusters, take all the
power I can make, and cost roughly a hundred bucks a pop to build... I
don't operate the other bands much and can make do with simple
dipoles.... Being that I have ADD (antenna deficit disorder) I am
busily working on other ideas now...

denny / k8do