[Towertalk] ping-pong stacks

[jljarvis]

Folks,

Anybody got any feedback they'd care to offer on the topic of
feeding a 2 yagi stack OUT of phase?  

Anybody experimented or modelled with less than 180 degree 
phase reversals?  i.e. 90, 60, 30...and what happens with
vertical angle lobe steering?  

I'm working up to an experiment preceeded by a model,
and possibly only a model, if it doesn't look good...
but thought I'd ask for inputs first.

Tnx.

Jim n2ea