w8io

The W8IO Antenna Site - Loggi - 144-19

(updated 18 Jan 2016)


2 Meter Loggi - Optimized for Gain, Clean Radiation Pattern and high F/R
This particular Loggi was created and optimized for high gain, a clean radiation pattern with small sidelobes and a high F/R at 144.1 MHz.  The plots are shown below. Here is the NEC2 file.

Loggi 144-19 Performance

Electrical Performance at 144.1 MHz0.188" Element Diameter
Directive Gain (dBi)14.74
Power Gain (dBi)14.63
E-Plane F/R (dB)32.45
H-Plane F/R (dB)28.92
E-Plane 1st Sidelobe (dB)-29.3
H-Plane 1st Sidelobe (dB)-21.1
E-Plane Beamwidth (deg)34
H-Plane Beamwidth (deg)37
Max VSWR (144-146 MHz)1.9
4 Bay G/T (dB) at TBD

Mechanical Performance:
Boom Length        19.36 feet        5.9 m        2.836 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-144-19 current diagram


Loggi-144-19 VSWR


Loggi-144-19 Gain (dBi) and F/B and F/R


Loggi-144-19 azimuth pattern at 144.1 MHz


Loggi-144-19 elevation pattern at 144.1 MHz




Comments are welcome!

contact Roger: email to 

rgcox2 (at) gmail.com

Roger Cox W8IO - Spring Lake, MI