Nothing foolish or magical about it. It uses quarter wave verticals with
two radials for the yagi elements - very much like the old Gizmotchy
(But hopefully with more realistic gain numbers.)
The advantage is that it doesn't rely on height above ground to get low angle
radiation - though good ground conductivity is important. But for a DXpedition
from a beach they would be great. Just like a regular yagi you can build
them with any number of elements.
If you can't find a set of dimensions, it wouldn't be difficult to come up with
a set by modeling, starting with any standard yagi design.