G0KSC SC0608L 8el 50Mhz Yagi Antenna with a 9.8 Metre Length Boom

This antenna has been redesigned and represents what i beleive to the the 'ideal boom length' for an OWA direct feed 50Ohm Yagi. This can be seen in the model in the super flat SWR, the high levels of F/B ratio along with the excellent gain and pattern.

The model below is designed with 12.7mm / 1/2 inch elements and also a 12mm element version below. If you require a version of this antenna with another diameter wire, Email me and I will remodel. It is NOT POSSIBLE to simply resize the elements when using a VERY different diameter wire and get the best performance possible. Element positions also need to change for the ideal antenna to be achieved again. Please read all the way down this page, there are other versions of this antenna using tapered elements too. As I have more requests, I will remodel in other element diameters and tapers and pulbish those too.

2 x 8el G0KSC OWA installed at BA4SI

MM0GPZ built the 8 element 6M G0KSC OWA Yagi form the RSGB 2009 Field Day

Dimensions in Metres - all tubing 1/2 inch or 13mm diameter, mail for other sizes and tapered elements

Element spacing:

• Ref =      0
• Driven =  .666
• D1 =       .949
• D2 =       2.082
• D3 =      3.790
• D4 =      5.713
• D5 =      7.909
• D6 =      9.800

Element sizes per element half:

• Ref =       1.481
• Driven =   1.4535
• D1 =        1.387
• D2 =        1.3685
• D3 =        1.3395
• D4 =        1.3235
• D5 =        1.302
• D6 =        1.2765

Performance figures @ 50.150Mhz:

• Froward Gain: 13.23dBi free space
• Front to Back: 23.46dB

Dimensions in Metres - all tubing 12mm

Element spacing:

• Ref =      0
• Driven =  .666
• D1 =       .949
• D2 =       2.082
• D3 =      3.790
• D4 =      5.713
• D5 =      7.909
• D6 =      9.800

Element sizes per element half:

• Ref =       1.482
• Driven =   1.4545
• D1 =        1.388
• D2 =        1.3695
• D3 =        1.3405
• D4 =        1.3245
• D5 =        1.303
• D6 =        1.2775

Performance figures @ 50.150Mhz:

• Froward Gain: 13.22dBi free space
• Front to Back: 23.73dB

Azimuth Plot

Elevation Plot

This fantastic antenna at 20m up

An Excellent SWR to go with the fantastic pattern!

Remeber, mail me if you have different diameter tube requirements and send photos of built antenna!

G0KSC SC0610M 10el 50Mhz OWA Yagi Antenna with a 15.2 Metre Length Boom

This antenna has been redesigned and represents what i beleive to the the 'ideal boom length' for an OWA direct feed 50Ohm Yagi. This can be seen in the model in the super flat SWR, the high levels of F/B ratio along with the excellent gain and pattern.

The model below is designed with 12.7mm / 1/2 inch elements. There is also a 12mm element version below too. If you require a version of this antenna with another diameter wire, Email me and I will remodel. It is NOT POSSIBLE to simply resize the elements when using a different diameter wire and get the best performance possible. Element positions also need to change for the ideal antenna to be achieved again. Please read all the way down this page, there are other versions of this antenna using tapered elements too. As I have more requests, I will remodel in other element diameters and tapers and pulbish those too.

Enjoy the antenna and if you build, Please Send me photos!

Dimensions in Metres1/2 inch element version

Element spacing:

• Ref =       0
• Driven =  .772
• D1 =       1.069
• D2 =       2.183
• D3 =       3.921
• D4 =       5.946
• D5 =       8.190
• D6 =      10.594
• D7 =      13.103
• D8 =      15.200

Element sizes per element half:

• Ref =       1.4735
• Driven =   1.4585
• D1 =        1.3915
• D2 =        1.371
• D3 =        1.342
• D4 =        1.319
• D5 =        1.2995
• D6 =        1.279
• D7 =        1.2605
• D8 =        1.268

Performance figures @ 50.150Mhz:

• Froward Gain: 14.67dBi free space
• Front to Back: 28.06dB

Dimensions in Metres 12mm element version

Element spacing:

• Ref =       0
• Driven =  .772
• D1 =       1.069
• D2 =       2.183
• D3 =       3.921
• D4 =       5.946
• D5 =       8.190
• D6 =      10.594
• D7 =      13.103
• D8 =      15.200

Element sizes per element half:

• Ref =       1.474
• Driven =   1.4595
• D1 =        1.3925
• D2 =        1.3715
• D3 =        1.3425
• D4 =        1.3195
• D5 =        1.300
• D6 =        1.2795
• D7 =        1.261
• D8 =        1.2685

Performance figures @ 50.150Mhz:

• Froward Gain: 14.64dBi free space
• Front to Back: 29.08dB

The Azimuth plot of this fantastic 50 Ohm Split dipole antenna

The super-clean elevation plot

Elevation plot of this antenna 20m (66') above ground.

And finally the fantastic SWR curve - it does not get better than this on a 50Ohm Split dipole Yagi!

Element diameter:

Each element is made out of single piece 1/2 inch (12.7mm) aluminum tubing Each element half length needs to be doubled in order to gain your total element size.

NOTE:

You can build this antenna with 13mm diameter tubing using the same parameters above. Slightly higher front to back ratio and forward gain will be seen along with a narrower SWR curve. For other element diameters, please Email me.