See the original article for reference. This is an update.

I have since changed the capacitance wires to stranded copper instead of the solid stuff I started out with. While I didn’t have any breakage, the hard drawn copper is not much good for applications that involve much flexing.

Also here are the dimensions:
10′ steel conduit 1/2″ od (one above one below insulator)
24″ 1/2″ PVC pipe insulator. Get PVC that fits snugly with the conduit inside it.
Total length should be 33′ 11″ (or about 1035cm) from tip to tip.

Note: you can lengthen the loading wires to 6′ while keeping all the rest the same and it will be tuned for 30 meters.

You can look this up on page 22.31 of the 2008 ARRL Handbook, credit (and a big thanks) for the design goes to K8CH.

I constructed mine by making three “wire holes” on either side of the insulator to run #14 solid conductor copper wire from the SO-239 connector mounted in the center to the ends, helping ensure good contact with the steel by weaving the wire in and out. The center conductor goes to the top, braid to the bottom. Then I inserted the conduit sections, measured, and drilled four holes at different places for sending lath screws into the pvc and holding the conduit in place. At least one screw went through some of the exposed wire that was woven in the ends to ensure a very tight connection to the inserted conduit. Everything was sealed with silicone.

Capacitance wires were attached through two holes made in the top and bottom, soldered/screwed to the conduit, and the top was hot-glued solid around the wires to help keep rain out. A cap would have been nicer for the top but I couldn’t find one to fit.

It’s guyed at 4 points with nylon cord. You must use non-conducting guys for this antenna, past the capacitance wires at least. It is mounted with two hose clamps on a 12′ wood pole and also attached somewhat loosely to the tree in several points. Evaluate how much your tree will move in the wind and make your own judgment there, mine sways a lot. You may need to use two common mode chokes (7 turns, ~8″ diameter circle air choke with the coax) one at the antenna and one where the coax meets the shack to keep RF from flowing on the braid if your feed line does not approach the feed point at a 90 degree angle.

SWR of 1.4:1 on 14.070mhz when mounted 12′ above ground. Solid performance, have worked Asia on this already, a first for me.

It has held up to some pretty nasty winter days surprisingly well. I still think aluminum/fiberglass would be a far better materials choice but you have to make do with what’s available.