Looks like Dan is building a copy, his site has some interesting babble going on about it.
He clearly hasn't read the studies on this forum mostly by
@bob85 and
@Marconi with additional contributions from a few others on this forum, or it is possible that he read raid studies and didn't understand them, certain aspects of how this antenna actually functions take a certain understanding that goes far beyond the average technician. There are things happening with this antenna that I haven't seen happen in any other antenna out there such as the current distribution on the mast, or the part of the mounting bracket that is right next to the feed point yet appears at first glance to have no currents flowing on it in spite of the fact that there are peak currents flowing on both sides of said conductor. I can go on here.
This really is a fascinating antenna, and I haven't seen very many people give an explanation that even understands that quirks and oddities even exist with this antenna, much less take any of them into account when describing how this antenna actually works. Typically, people just put this antenna into whatever category they feel it looks like or whatever info is found online that looks good at first glance, and go with that.
I want to credit
@bob85 and
@Marconi specifically, as well as a few others, who have done a lot of work trying to figure out what is actually going on with this antenna design. I don't think they exactly agree with each other, but their opinions are going to be among the best out there.
The DB