On Tuesday, February 18, 2014 6:26:40 PM UTC-6, David Platt wrote:
The feed arrangement is
different (it's open at the feedpoint, rather than being fed a few
inches above a short), and the arm lengths are different than with a
"classic" J-pole.

If one will ignore the long 2m element and draw a schematic of it just for the 70cm band, one will realize that it is actually just a standard Zepp antenna.