The W8IO Antenna Site - Loggi - 144-27A1

(updated 24 Jan 2016)

2 Meter Loggi - Optimized for Extremely High Gain, Clean Radiation Pattern, High G/T and High F/R
This particular Loggi was created and optimized for extremely high gain, a clean radiation pattern with very small sidelobes and a high F/R at 144.1 MHz.  The resulting G/T was excellent. The plots are shown below.

Loggi 144-27A Performance

Electrical Performance at 144.1 144-27A1144-27A2144-27A3144-27A4144-27A5144-27A6
Directive/Power Gain (dBi) 16.05/15.9416.65/16.5116.35/16.2416.11/16.016.19/16.0816.18/16.07
E-Plane F/R (dB) 38.2729.3234.5535.3934.9835.04
H-Plane F/R (dB)32.6824.8528.9732.4134.0333.8
E-Plane 1st Sidelobe (dB)-20-17.7-17.5-22-23-20
H-Plane 1st Sidelobe (dB)-18-15.1-14.8-18.3-19-18
Min/Max VSWR (144-146 MHz) 1.18/1.741.02/1.851.06/1.781.13/1.831.11/2.01.14/1.96
4 Bay G/T (dB) at 178" (E) x 170" (H) - 4.5m x 4.3m-1.47---1.39-1.29-
NEC2 File144-27A1144-27A2144-27A3144-27A4144-27A5144-27A6
4 Bay NEC File----144-27A5x4-

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

Mechanical Performance:
Boom Length        25.85 feet      7.88 m      3.8 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

LP144-27A1 current diagram

LP144-27A1 VSWR

LP144-27A1 Gain (dBi) and F/B and F/R

LP144-27A1 azimuth pattern at 144.1 MHz

LP144-27A1 elevation pattern at 144.1 MHz

Comments are welcome!

contact Roger: email to 

rgcox2 (at) gmail.com

Roger Cox W8IO - Spring Lake, MI