There is a picture of 5ghz dish antenna on the slides from ubnt presentations.
Ubiquiti has an expanding line of dual polarized antennas that mate to the Rocket radio.
ubnt 5ghz dish feed
MIMO Sector Antennas
Archive for the ‘Sector’ Category
More Info About UBNT Antennas
Saturday, October 17th, 20095Ghz 60deg Sector WIFI Antenna
Tuesday, June 23rd, 2009Link :
Printed on dual sides of 1mm FR4 board.
60 degrees sector.
Price mentioned around 130 euros
I thing that this can be used as omni antenna without the reflector. And can be build with more or whit less dipoles for tests.
5Ghz Sector Wifi Antenna
5Ghz Sector Wifi Antenna schematic
DIY WIFI Antenna Double-Dual Biquad 16-17 dBi
Tuesday, June 9th, 2009Double-Dual Biquad 16-17 dBi
double-dual-biquad-16~17dbi
What can I say – looks interesting 
And must be tested maded enataerly from pcb plate, or instad of pcb to try with coax ?
zero is back online – here is the link for the tread : http://www.zero13wireless.net/foro/showthread.php?t=4248