671 MHz

Reflector	8.5"	3.51"	8.46"	4.21"
Driven	8.29"
Director	7.375"	1.34	7.99"	1.33

http://www.changpuak.ch/electronics/yagi_uda_antenna.php
Javascript Version 12.01.2014, based on Rothammel / DL6WU

Frequency     :  671  MHz
Wavelength    :  447  mm
Rod Diameter  :  1.5  mm
Boom Diameter :  20  mm
Boom Length   :  224  mm
d/lambda      :  0.003    ( min.: 0.002 , max.: 0.01 )
D/lambda      :  0.045    ( min.: 0.01 , max.: 0.05 )
Elements      :  4
Gain          :  6.77 dBd (approx.)

Reflector Length   : 215 mm
Reflector Position :  0 mm

Dipole Position    : 107 mm

Director #1 Position : 141 mm ,  Length : 203 mm
Distance Dipole - Dir. #1 : 34 mm 

Director #2 Position : 221 mm ,  Length : 201 mm
Distance Dir. #1 - Dir. #2 : 80 mm 

Directors / Parasitics are isolated.
Please choose an isolater thicker than : 10 mm

540 MHz

http://www.changpuak.ch/electronics/yagi_uda_antenna.php
Javascript Version 12.01.2014, based on Rothammel / DL6WU

Frequency     :  540  MHz
Wavelength    :  556  mm
Rod Diameter  :  10  mm
Boom Diameter :  20  mm
Boom Length   :  295  mm
d/lambda      :  0.018    ( min.: 0.002 , max.: 0.01 )
D/lambda      :  0.036    ( min.: 0.01 , max.: 0.05 )
Elements      :  4
Gain          :  6.77 dBd (approx.)

Reflector Length   : 268 mm
Reflector Position :  0 mm

Dipole Position    : 133 mm

Director #1 Position : 175 mm ,  Length : 252 mm
Distance Dipole - Dir. #1 : 42 mm 

Director #2 Position : 275 mm ,  Length : 250 mm
Distance Dir. #1 - Dir. #2 : 100 mm 

Directors / Parasitics are isolated.
Please choose an isolater thicker than : 10 mm