In a message dated 3/17/00 7:21:07 AM Pacific Standard Time, tesla-at-pupman-dot-com writes: > leaving the center open to the air. Is it necessary > to go to such an extreme to limit dielectric loss. If not, what material > would be best suited for a secondary form. > > Thanks, > > Blair Blair, In reality, the dielectric loss is not a problem, and easy to obtain materials such as PVC pipe, work well. Cheers, John Freau