A 6 element LFA Yagi for 28MHz with a 11.960mtr boom
Premium commercial versions of this antenna at Innovantennas
This is a high-gain, wideband LFA (Loop Fed Array) Yagi which covers 28 - 28.5MHz with an SWR of less than1.3:1. It has options with both UK/USA and European sized tube and has a 3 section taper.
This Antenna has been modelled using NEC4 and confirmed by FEKO. This is thousands of dollars of the very latest antenna design software available and the results are highly accurate. When loading into your software, you will see similar SWR but not the same. Please do not alter the model, build to these dimensions for the best results.
Contact me if you are unsure what correction (if any) you require for the element holders/stand-offs you will use or any other questions you may have or require different element diameter.
Antenna Layout and Construction:
Performance
11.97dBi @ 28.250MHz
26.96dB @ 28.250MHz
SWR: Below 1.3.1 from 28MHz to 28.500MHz
Antenna Dimensions for UK/USA sized tubing - European version below
Taper: Mid Section, 5/8 inch or 16mm tube (total length 1.828m). Outer section 1/2 inch or 13mm tube. End sections as per below schedule and in 3/8 inch or 10mm.
Spacing End Section Length (All below sizes in Metres)
Reflector 0 .739
DE1 .598 0.275 - FEEDPOINT
DE2 1.577 0.275
D1 2.807 0.565
D2 5.384 0.503
D3 8.591 0.459
D4 11.960 0.340
Adjust loop width for best SWR upon completion. Fit antenna with a 1:1 balun
Polar Plots
Azimuth Plot of this super antenna
Elevation plot of this antenna
1 x 5el at 20m above ground
SWR Plot
Any questions, please ask!
Justin G0KSC