Fishing pole tubes might work for support, some thick aluminum ones go pretty deep. Screw in beach umbrella holder work okay. Gotta match diameters. I used a screw in dog leash with a I think a Shakespeare fishing pole and a very light dual band.
A little height helps a lot.
How portable? For larger poles like fiberglass telescopic poles and carbon fiber poles I use a pvc support tube with pole to pole brackets attached to bike rack. I guess those are mobile rather than portable.
For the 2nd story balcony I use 12 inch wall offsets attached to a hardwood board that clamps onto several railings with another hardwood backboard via long threaded bolts, gets me about 55 feet off the ground with a carbon fiber telescopic pole and an arrow 3 element yagi and a little shorter with diamond x50 and diamond x200 and a couple other dual banders. People take pictures but so far no formal complaints; I put it up for a few hours at a time and take it down.
But a good backpackable 20 footer would be nice. I use a few pvc sections to get Elk 2band up about 12 feet handheld and fits in a small zipper bag, and that works well. Just the other day heard some people talking about the twist lock carbon fiber telescopic poles, must be some decent short ones out there. Chinese manufacturers seem to have a lot.of them but I'm afraid to order on alibaba.
To fit diameters for the mobile poles I use pvc tubes, cut them lengthwise and heat them to expand them, or cut a lengthwise section out and heat it up and fit on the pole and hold it tight while it cools. Whichever works to get a good fit.
Always wondered about these, maybe 32 footer but only use it to 20 feet with a light yagi or vertical..
