This one didn't get any traction here, and that's ok. It doesn't really deserve any.
It was something I was asked to do, and I did. so here's the last of it.
Ok. The latest, and despite my previous commitment to redo the thing to exact materials specs, perhaps my last.
Redoing it to the exact specs was an extension of my belief that the antenna might have some possibilities as a portable system.
That was based on some encouraging results and the video with a decent radio check I recorded.
Of course, on some of the forums I said I did not believe it was a beam, and still don't. It is a dipole, off center fed. The feed system settles that - braid to one half the antenna, center conductor to the other. Simple.
Today I decided to test a thought that occurred to me based on experience with other types of shortened antennas, NGPs (no ground plane) in particular. Those antennas have a single thing in common - they depend on the coax to be part of the radiating system. To test this idea I mounted the antenna just as before, but this time I inserted a coax choke one foot from the connection point of the feed line to the antenna to defeat any potential CMC, and thus prevent the coax from being a radiating element.
Just as I suspected, anything remotely resembling a match, or resonance across multiple bands wasn't happening for me. It is my opinion that this antenna depends on the coax to be part of the radiator.
Here is my personal conclusion: Can it be used as a portable antenna on 11 meters?
Yes, but you must be careful of the coax length in order to get a match. Is there a special length to be used?
I doubt it. Just so there is enough to get the job done should do. Too short a coax will not provide enough length to radiate at the 11 meters band. I suspect that conductive surfaces near it will likely affect it. Is the antenna a beam?
No. It's a dipole - a split element, off center fed dipole. Should one buy one?
If they wish. It isn't useless, and could be fun. It certainly doesn't use too much space as many 11 meter antennas tend to do. Would I buy one?
Of course not, I already have one.