BR,
This is the 'best' that I could find with a quick
'Google' search. (Spelling as I found it.)

"Basically it is a twin line radiator driven by a
toroidal transformer so as the two lines are fed
in fase.
This article was originally inspired by the
"G5IJ
Push-Push Twin Line antenna" in Radcom March
1996 - Technical Topics by Pat Hawker G3VA."

Don't know as it will help much, but at least it's a start.
'Doc