I built a biquad using the data here http://martybugs.net/wireless/biquad/

This antenna was very impressive for it's size.

I added it to a dish.

This setup works quite well. Combined with a 2W amp on each end, was able to do a 9.6 mile link with another station that is using that 24dBi grid antenna with a 92% link quality.  The bare biquad actually was able to do the link as well. Don't have link quality data, but it showed up on the signal strength screen.