Wifi runs at 2.4Ghz... There are tons of high gain antennas available for 2.4Ghz
band, some of which are pretty reasonable.

Thanks
--Rick

Mitchell wrote:

Looking for a design for a multi-element (10-20) yagi antenna that I may use
for sending/receiving wireless audio/video used for surveillance system.
Not having the best of luck finding same at this point.
Any help for one's already designed or a good formula to go by to build my
own.

Thanks,
Mitchell