Hello Smiley: The lengths as you can see are all adjustable, and can be figured pretty close as looking at the antenna and photos. One very important thing I didn't say was this antenna modification I used a antenna analyzer to tell me were the antenna was working or lower SWR frequency. This allowed easy adjustment to get on CH 20 for the guy.

JAFO thats right, good call.

I don't remember adding extra length to the antennas vertical element. But looking at the photos I do NOT believe I lengthened the vertical element to be close to the Penetrator 500 length. The Hairpin matching lengths can be first made with 12 gauge house wire to get a feel for what is needed in lengths for the tubing. The solid Aluminum rod is not needed, its just what ever I had on hand in the scrap pile.

Even old 1/4 inch copper tubing I took of my swap cooler will work and cut it to allow the lengths to be adjusted using hose claps to hold it together. Sometimes I flatned the copper tubing in a vice to make easier to use. Not critical.

One other thing that antenna testing needs, is document all the element lengths, and record the VSWR. And with every change record the length changes and resulting VSWR. Many a antenna tester dude has walked away thinking all this antenna tuning is hopeless needing a drink or two. When he is going in circulies testing the same thing twice and going no were, because we didn't document or track past configurations. I know.

I have a 10 foot mast that I can raise and lower antennas on to test. While standing on a ladder and looking at the antenna analyzer I can adjust the tuning elements easily. Once you start tuning you will get a understanding and feel for it.

So give it a try give me a blast if you want. Good luck.

Jay in the Great Mojave Desert