On Wed, Jul 5, 2023 at 02:55 PM, Mike wrote:
It's solid, not foam.
Actually foam, being mostly air, would be better. Another approach would be to drill many holes in the material, leaving a skeletal frame which, again, is mostly air. This is essentially what B&W does with their Miniductor stock, plastic rods are melted into the wire coils, stabilizing them physically while ensuring that the electric fields mostly encounter air.
73, Don N2VGU
Donald S Brant Jr