In prep for the upcoming through-the-ground communications experiments this month, I spent the last couple days fabricating a large Tesla Coil secondary out of UHMW polyethylene.

Target frequency is just above the 160m HAM radio band, so about 2-2.4mc

Using RG316 coax cable since it is silver coated and has a quite large surface area. Only the outer sheath is being used in this instance.

I intentionally left it oversize to allow lots of room for trimming to hit the target frequency. It’s better to be 10 feet too long than one inch too short.