Hi Phil, thanks for your questions. Target of my post was to show an alternative to a spike. So I didn’t explain the antenna. Your second assumption is right. The device, I use to erect a fibre pole for my linked dipole. Screw it in, insert the pole into the pipe end, add the wires and stretch the pole, done. I only found this picture. It shows the complete antenna, so the fixture is hardly to see.
For verticals I use the wood screw design too. See Short vertical on three Summits in Allgaeu Alps
The vertical is cheap, if you don’t count the hours you spent, but it is not from AliExpress.
I guess, I’m somehow antenna mad (-;
73, Berthold, DK1BZ