The QRPer Board

Just to try explaining it better, see the image below (ugly but hopefully "readable")

Please, post an update when you'll try it !

A suggestion, make the "box" hosting the 9:1 and choke a bit longer so that the two toroids will sit flat side by side laying on the bottom and not one over the other, also consider enlarging the sides a bit and having some rectangular slot holes at the sides, these will serve to host some...

Ok, now I feel like a dummy. I have a TransWorld TW2010 (pretty much a commercial version of your double T bar) but I was concerned about taking up too much space in the car. Next time... if the antenna is this one https://www.dxengineering.com/parts/dxe-tw-2010-p then once closed it isn't too big ...

Considering how easy it is to build https://vk6ysf.com/unun_9-1_v3.htm I think it won't be a problem building one of them as desired :) the "ground" goes to the counterpoise(s) or to ground stake, a small IP66 electrical junction box will host the toroid, the wire connectors and the coax o...

the double t-bar may be unsuitable for some spots, but imVVHo will serve you well in all other cases when you can't set up an endfed wire

for "no tree" or "no wires up trees" situations, consider the *double t bar" antenna

https://www.qsl.net/hb9mtn/hb9mtn_vertdip.html

a ground stake or a tripod will support it, and while the gain isn't high, the takeoff is low, even if the antenna is near ground

or just a "one fits all" random wire which can be installed in different ways, including inverted L

for fixed ops one side of the antenna may be suspended to a rope tied to a weight, so that the antenna wire is free to slide, for portable one may use an alligator clip, if someone/thing trips over the antenna wire the alligator releases it

check the POTA cables here

https://messi.it/en/catalogue/50-ohm-rf ... t-coax.htm