Based on a "back of an envelope" calculation using his 180 degree horizontal and 50 degree vertical beam widths, I would say that you are pretty close Peter, perhaps even slightly high. His claimed 14 db gain is way out of the bounds of reality.
David
The R/C hobby world is full of wild and outrageous claims and this type of unsubstantiated BS.
Disinformation published on one website soon spreads, and becomes gospel before too long.
Even more so on the likes of Facebook with the 24 hour attention spans.
As an antenna manufacturer, KJ4RIV has reached a God like status, even with dumbed down advice (that just becomes plain inaccurate) as seen here:
Never let the facts get in the way of a good story!
It does demonstrate that embracing online, and utilising such things like video, can get people excited over something and want to get involved.
It's regrettable that ham radio missed this ship, as it's already sailed.
Pepper box no, Pizza box - yes.
I designed it was a bit of a joke for 3.5Ghz to help people with poor "unwired" coverage.
The sad thing is it worked and lots of non technical people built them.
The pepper box looks a LOT like the antenna elements that you see in everyday mobile phone panel antennas.
They're even mechanically steerable.