I have seen something similar to this on some motorcycle sites. Sometimes it is interesting!
Today I finished building a coil similar to the plans on the SSTRAN site. I prepped it for install, only to find my antenna analyzer wouldn't go down low enough in frequency. Now I am scrounging thru my hf swr meters to see if any of my stuff will read that low power and frequency. Needless to say, I don't usually do qrp!
I did install it and "roughed it in", with the TH 5, If nothing else, it looks cool, and it may be a little more efficient. But, not being able to verify swr, I am not sure.
Decided to add a note: The TH is mounted in the toolbox on the roof at my warehouse. It was using the internal tuner with the 102 in. whip. When I added the coil, I flipped the switch to external and installed a short piece of coax from the F connector. I am in theory, in compliance for length of antenna and ground (supplied thru the coax shield to the toolbox).
Happy 4th of July to all!