w8io

The W8IO Antenna Site - Loggi - 144-22MG

(updated 24 Jan 2016)


2 Meter Loggi - Optimized for Maximum Gain and high F/R
This particular Loggi was created and optimized for very high gain and a high F/R at 144.1 MHz.  The plots are shown below.

Loggi 144-22MG Performance

Electrical Performance at 144.1 MHz0.250" Element Diameter
Directive Gain (dBi)15.40
Power Gain (dBi)15.33
E-Plane F/R (dB)29.32
H-Plane F/R (dB)27.81
E-Plane 1st Sidelobe (dB)-18.9
H-Plane 1st Sidelobe (dB)-15.7
E-Plane Beamwidth (deg)32
H-Plane Beamwidth (deg)35
Max VSWR (144-146 MHz)1.7
NEC fileNEC2 file
4 Bay G/T (dB) at 160" (E) x 150" (H)-2.29
4 Bay NEC file4 Bay NEC file

Compare the Electrical Performance to long Yagi beams: VE7BQH Gain table for 144 MHz (DXMaps)

Mechanical Performance:
Boom Length        21.87 feet        6.67 m        3.2 wavelength at 144.1 MHz
Recommended Feed Boom diameters: 1" to 1.25" square (DX Engineering or On-Line Metals)
Recommended element sources: On-Line Metals, McMaster-Carr



Loggi-144-22MG current diagram


Loggi-144-22MG VSWR


Loggi-144-22MG Power Gain (dBi) and F/B and F/R


Loggi-144-22MG azimuth pattern at 144.1 MHz


Loggi-144-22MG elevation pattern at 144.1 MHz




Comments are welcome!

contact Roger: email to 

rgcox2 (at) gmail.com

Roger Cox W8IO - Spring Lake, MI