Wow – dimentions for 28dbi 5ghz wimax antenna are available thanks to : kleiner-onkel from www.carookee.com/forum
more pictures from this antenna here :
http://www.digdice.com/5ghz-28dbi-wimax-pcb-panel-antenna/
5ghz 28dbi wimax wifi antenna dimentions
Link : blog.freifunk-halle.net
Interesting DIY 5ghz loop dish antenna for wifi.
All parts are listed on site – google translator do not work and I cant translate all, but all the parts are here on the photos.
DIY 5ghz wifi dish antenna - reflector
Double-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 ?
www.zero13wireless.net is deleted the pictures of this antenna???
More here diy-biquad-wifi-antenna.blogspot.com