Canvey Island, Essex, England Justin@g0ksc.co.uk
VM - Featured products
Twin boom quad
144MHz LFA Yagis
144MHz LFA Yagis

Low Noise LFA Yagis designed by G0KSC free to build for personal use.

144MHz LFA Yagis
70cms LFA Yagis
70cms LFA Yagis
Twin-Boom G0KSC Quads
G0KSC Twin-Boom Quads
Twin-Boom G0KSC Quads
G0KSC Custom Dish feeds - Above installation @ HB9Q
Custom low-noise dish feeds
Custom low-noise dish feeds
G0KSC Custom Dish Feeds

Above installation @ HB9Q

G0KSC Custom Dish feeds - Above installation @ HB9Q
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A 5 element LFA Yagi for 28MHz with a 8.2mtr boom - 5LFA10HZE

Premium commercial versions of this antenna at Innovantennas

I WILL MODEL THIS ANTENNA IN ANY TUBE SIZE OR TAPER SECHDULE FOR YOU, CONTACT ME VIA EMAIL

This is a high-gain, wideband LFA (Loop Fed Array) Yagi which covers 28 - 28.5MHz with an SWR of less than1.1:1. It has options with both UK/USA and European sized tube and has a 3 section taper. It was designed for CT1HZE and now available for all to use.

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.

Antenna Layout and Construction:

Performance

10.73dBi @ 28.250MHz

20.26dB @ 28.250MHz

SWR: Below 1.2.1 from 28MHz to 28.500MHz

Construction details:

Refer to the above drawings

Antenna Dimensions for UK/USA sized tubing - European version below

Taper: Mid Section, 5/8 inch tube (total length 1.2m). Outer section 1/2 inch 1.1m long. End sections as per below schedule

                          Spacing                  End Section Length (All below sizes in Metres)

Reflector                0                              1.026

DE1                         .483                        0.550 - FEEDPOINT

DE2                       1.453                        0.550

D1                         2.492                         0.852

D2                         4.839                         0.766

D3                         8.178                         0.632

Adjust loop width for best SWR upon completion. Fit antenna with a 1:1 balun

Antenna Dimensions for European sized tubing

Taper: Mid Section, 16mm tube (total length 1.2m). Outer section 13mm tube 1.1m long. End sections as per below schedule

                           Spacing                      End Section Length (All below sizes in Metres)

Reflector                0                              1.022

DE1                         .483                        0.547 FEEDPOINT

DE2                      1.453                         0.547

D1                        2.492                         0.848

D2                        4.839                         0.762

D3                        8.178                         0.628

Adjust loop width for best SWR upon completion. Fit antenna with a 1:1 balun

Stacking distance: 8m

Gain:                          13.42dBi

F/B:                             20.40dB

Polar Plots

Azimuth Plot of this super antenna

Elevation plot of this antenna

A 2 Stack with 8m distance between

1 x 5el at 15m above ground

2 x 5el at 15m above ground (15m to bottom antenna)

SWR Plot

Any questions, please ask!

Justin G0KSC