In article , WShoots1 says...

Attach a wire the length of the last segment. It might not be pretty, but
I'll bet it would work .

Maybe an aluminum knitting needle will work. It can fit down into the hollow
whip.

Bill, K5BY

Tried it already with a short piece of whip antenna from my junk box. There's
something inside the last extension that prevents it from going in very far.

elfa