Topband: a variant on elevated radials

[Jim Jarvis]

TB:

K3ANS uses an antenna which has several 1/4 wave 'radials' coming off
his 120' tower at the 90' level.  Coax snakes up the tower, with the
'radials' fed from the center conductor, and the shield connected to
the tower.

It seems to be a very effective topband antenna into Asia/PAC from eastern
Pennsylvania.

I'm wondering if anyone has modelled this beast, what it's called, and
what the model reveals about theoretical performance.

TIA,

N2EA