While working on an airport S band radar I taped my WiFi detector to the feedhorn and rotated the antenna. I was picking up signals from all over the place, at least 100 different ones probably more that I could not discern from the others. With the detector removed from the feedhorn I could only get 4, I think they are all the WiFI for the airport.Gain of the antenna is 31db with a cosecant squared vertical radiation pattern. Its amazing what a really good antenna will do.
Jimmie