Scaling shouldnt be an issue so start by looking at 1296MHz antennas.
You can always computer model them as well. Have a look at Mr Cebiks'
website. (http://www.cebik.com) I'd actually recommend you look at a
corner reflector. Nowhere as critical as a yagi and pretty easy to
build. Maybe even a 3D corner?

I've been wanting to try a Sterba curtain (on 900mHz) over a planar
reflector. That wouldnt be real critical either.

Cheers Bob Vk2YQA

wrote:

Exactly what i wanted to know, i may hold off on this one and search
for a different type high gain uhf antenna. Only problem is all
the design programs i have found on the web for yagi or log perodic
antennas are for 6-8 elements maximum, @ 900mhz i would like to have
as many elements as a boom would support. So my next question would be
where to look for a multi element beam using atleast a minimum of
twelve elements?