A 7el “owa” yagi on a 12,09 Meter boom, using “maco” style element diameters.:
11,74 dBI freespace gain and a 32,03 dB front to back (23,67 front to rear)
At 18 meter height the antenna produces 17,19 dBi under a 8 degree take off angle.
Element (half element) Length
Distance Length
0 Reflector 2 x 2,81 meter
1,496 M Radiator 2 x 2,72 meter
2,122 M Director 1 2x 2,555 meter
3,596 M Director 2 2x 2,497 meter
5,816 M Director 3 2x 2,490 meter
9,000 M Director 4 2x 2,466 meter
12,086 M Director 5 2x 2,386 meter
Dont forget “maco” elements are used.
If you need other diameters, please use the forum.