The W8IO Antenna Site - Loggi - 432-31

(updated 23 Nov 2015)

432 MHz Loggi - Optimized for High Gain,  High G/T and high F/R
This particular Loggi was created and optimized for high gain, high G/T and a high F/R at 432.1 MHz.  The plots are shown below. Here is the NEC2 file.

Loggi 432-31 Performance

Electrical Performance at 432.1         0.125" Element Diameter
Directive Gain (dBi)                                        16.63
E-Plane F/R (dB)                                            36.67
H-Plane F/R (dB)                                            35.2
E-Plane 1st Sidelobe (dB)                              -21
H-Plane 1st Sidelobe (dB)                             -18.6
E-Plane Beamwidth (deg)                                 29
H-Plane Beamwidth (deg)                                 30
Max VSWR (432-434 MHz)                           1.45
4 bay G/T (dB) at 58" x 58" spacing                 7.26

Mechanical Performance:
Boom Length       9.5 feet       2.9 m        4.18 wavelength at 432.1 MHz
Recommended Feed Boom diameters: 0.75" to 1.0" square (DX Engineering or On-Line Metals)
Recommended element sources: On-Line Metals, McMaster-Carr

LP432-31 current diagram

LP432-31 VSWR

LP432-31 Gain (dBi) and F/B and F/R

LP432-31 azimuth pattern at 432.1 MHz

LP432-31 elevation pattern at 432.1 MHz

Comments are welcome!

contact Roger: email to 

rgcox2 (at) gmail.com

Roger Cox W8IO - Spring Lake, MI