What about F9FT - i've experience to make this ones m.b. 15 years ago - nice antennas , it is possible to recalculate up to 600 - 700 MHz.
but for WiFi - maybe some problems if only scale down.
to EIRP
That's great )))))))))))) !!!!!!!!!
Really professinal aproach, minimum time to alignment. Is this your's device?
Sweet songs about this "helix-yagi" , but base at my experience i don't belive in 18dBi single yagi Easy-To-Build-Aligment-No-Need.
If u need a gain and have no antenna range the dish is only way, another case not more than 12-(14?) dBi. nice VSWR wich this gay said about , don't mean good gain.
Thanx