The 4" secondary is based on a 100mm PVC-pipe with 12mm plexidiscs on the top and ground end fixed with 8 M4 screws. Itīs wound with 1025 turns 0,6mm enamelled wire. H/D=6
Topload connection is done by a M8 rod, the top turn is 6mmē copper pipe to prevent Corona.
This is the ground connection made out of 0,5mm copper, itīs connected with M5 screws.