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 4 element OWA Yagi for 14MHz with a 9.828mtr boom

Premium commercial versions of this antenna at Innovantennas

This is a high-gain, wideband OWA (Optimised Wideband Array) Yagi which covers the whole of the 20m band with an SWR of less than1.1:1. It has options with both UK/USA and European sized tube and has a 4 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

Built by IK4UQA

'Is a honor and a pleasure for me the send you some photos of my realization of your project !!

The OWA worked "as is" as soon as elevated on the support, with great results on air (i'm not a big gun, but is nice to break throw some pile-up --also ST0R-- in one or two calls with only 90 watts  from my old FT1000MkV-Field !!)'

IK4UQA

Antenna Layout and Construction:

Performance

8.87dBi @ 14.175MHz

17.21dB @ 14.175MHz

SWR: Below 1.1:1 from 14MHz to 14.350MHz

Construction details

Refer to the above drawing.

Antenna Dimensions for UK/USA and European sized tubing

Taper: inner Section, 1.25 inch or 30mm tube (total length 2.2m). Mid Section 1 inch or 25mm tube,  Outer section 3/4 inch or 20mm tube. End sections as per below schedule ( 5/8 inch or 16mm tube).

                            Spacing                  End Section Length   (All below sizes in Metres)

Reflector                0                              2.022

DE1                      3.515                       1.885

D1                        5.416                        1.615

D2                        9.828                         1.340

Polar Plots

Azimuth Plot of this super antenna

Elevation plot of this antenna

Elevation plot of this antenna at 20M above ground

2 x 4el 10m apart, bottom antenna 10m up

SWR Plot

Any questions, please ask!

Justin G0KSC