https://www.changpuak.ch/electronics/yagi_uda_antenna.php
Javascript Version 12.01.2014, based on Rothammel / DL6WU
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Frequency     :  300  MHz
Wavelength    :  1000  mm
Rod Diameter  :  10  mm
Boom Diameter :  20  mm
Boom Length   :  2205  mm
d/lambda      :  0.010    ( min.: 0.002 , max.: 0.01 )
D/lambda      :  0.020    ( min.: 0.01 , max.: 0.05 )
Elements      :  10
Gain          :  11.80 dBd (approx.)
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Reflector Length   : 482 mm
Reflector Position :  0 mm
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Dipole Position    : 240 mm
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Director #1 Position : 315 mm ,  Length : 455 mm
Distance Dipole - Dir. #1 : 75 mm
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Director #2 Position : 495 mm ,  Length : 450 mm
Distance Dir. #1 - Dir. #2 : 180 mm
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Director #3 Position : 710 mm ,  Length : 446 mm
Distance Dir. #2 - Dir. #3 : 215 mm
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Director #4 Position : 960 mm ,  Length : 443 mm
Distance Dir. #3 - Dir. #4 : 250 mm
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Director #5 Position : 1240 mm ,  Length : 439 mm
Distance Dir. #4 - Dir. #5 : 280 mm
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Director #6 Position : 1540 mm ,  Length : 436 mm
Distance Dir. #5 - Dir. #6 : 300 mm
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Director #7 Position : 1855 mm ,  Length : 434 mm
Distance Dir. #6 - Dir. #7 : 315 mm
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Director #8 Position : 2185 mm ,  Length : 431 mm
Distance Dir. #7 - Dir. #8 : 330 mm
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Directors / Parasitics are isolated.
Please choose an isolater thicker than : 10 mm