w8io

The W8IO Antenna Site - Loggi - 21-7

(updated 28 Feb 2016)


15 Meter 7 Element Loggi
Here is a 7 element Loggi for the 15 meter Amateur band.  After a quick look at available large commercial 15 meter Yagis, I chose the M2 15M6DX Yagi and Force-12 15m OP-DES 6 element as my "standards" to compare to. The plots and specifications are shown below.


Electrical SpecificationLoggi-21-7F12-21-DES-6Loggi-21-8M2 15M6DX
Frequency Range (MHz)21.0 - 21.4521.0 - 21.4521.0 - 21.4521.0 - 21.45
Peak Gain - Free Space (dBi)11.1210.9511.5711.5
Typical Front to Back (dB)30322823
Max Front to Rear (dB)25.732.826.75-
Typ E-plane Beamwidth (degrees)50.551.64848
Typ H-plane Beamwidth (degrees)6366.65953
Maximum VSWR1.81.21.61.5
Boom Length (feet)37.537.074345
Type of antennaLoggiYagiLoggiYagi
NEC2 fileLoggi-21-7-Loggi-21-8-













Comments are welcome!

contact Roger: email to 

rgcox2 (at) gmail.com

Roger Cox W8IO - Spring Lake, MI