Here’s a 12 Element UHF Yagi antenna that I designed for my friend, 9w2azv. He’s going to use that antenna for his client, that needs to hit a repeater 10 kilometers away from their location.
Here’s are the measurement for the antenna :
Polar Plot for the Antenna (E-Plane)
Polar Plot for the Antenna (H-Plane) at 2 Wavelength height