The cage dipole simulates a conductor of much larger diameter than any
of the single wires, or even their total and the ends are tied together.
That being the case, other than simplicity and weight, why use an
insulator for the separator? How about a thin metal band, Aluminum
ring, or what ever? Wood has been used, wood soaked in paraffin as
well as other materials, but I've not seen any metal used. A disk would
be out except for small diameters due to the aerodynamic problems.
As a personal opinion I'd stick with 6" and larger diameter cages on 75
and 40 for the increased band width. Actually I thin 1' would work well
on 75.
73
Roger (K8RI)
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