The QRPer Board

You're right Mike, the advantage of AA5TB approach is that it could be used for a vertical (aluminium) antenna and it will ease "tuning" for the fundamental

yes all metric numbers just calc them as they are and convert them at end

And one which may fit portable operations ,(SOTA/POTA/...)

I'm referring to the ideas by AA5TB found here

https://www.aa5tb.com/efha.html

which are really good (notice the "tuned" 49:1)

boom and mast don't influence the radiation pattern so they can be conductive; a way to make the "JJ" portable is to mske it foldable; let's start from.the drawing and change it so that the reflector arms can telescope and may be unlocked and fold toward the antenna front (along the boom) ...

Welcome to the QRPer forum pick a seat and enjoy your stay; a question; you wrote about rig, but rig won't work without an antenna, which antennas fo you use/prefer ?

the antenna is similar to the one described here https://qrper.com/2023/11/a-portable-oblong-antenna-for-2-meters/ the calc formulas (in meters) are Lambda=300/MHz perimeter=Lambda*1.05 semip=perimeter/2 shortside=semip/3 longsidd=semip-shortside the antenna offers low takeoff angle and a gain over ...

https://www.theregister.com/2025/04/17/ ... ne_weapon/

used to "fry" drones

as for the multiband version, it uses a trapped dipole (straight) snd a reflector for each band made using wire
performance is below the one from the monoband version

Interesting, I'd never processed that the "Jungle Job" version has an angled driven element. I've previously built a G4ZU beam with a straight driven element and bent reflector. (In fact, on the G4ZU tribute page, that description is used, even though the figure shows the reverse!) An int...

zome interesting and useful informations https://practicalantennas.com/applications/nvis/ notice that the observations at the above link also apply to several antennas with horizontal polarization not just dipoles and then, this map https://practicalantennas.com/wp-content/uploads/2023/01/Dipole-Azi...