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Free Yagi Antenna Designs for Ham Radio

G0KSC SC0605M 5el 50Mhz Yagi Antenna with a 4.4 Metre Length Boom

updated June 2010

Please read the whole page, there are several versions of this antenna listed. If you do not the the diameter tubing you need to have this in or require tapered elements, Email me!

 

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 and also 12mm elements. 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 in my opinion, I remodel the whole antenna each time. 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.

 

 

The SC0605M at KF6A

'The SWR curve is where I want it to be with NO tweaking of the driven element....'

' BTW, it rained hard for 3 hours straight today and my SWR didn't flinch...'
- 'KF6A

 

 

the SC0605M at WA4NJP - Ray has now built a 9el LFA for 50MHz

 

'The last photo is the 5 ele 6 meter on 4.4 meter boom, a very good working little ant.'

- Ray, WA4NJP

 

 

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

Element spacing:

  • Ref =      0
  • Driven =  .729
  • D1 =       1.223
  • D2 =       2.791
  • D3 =      4.405

Element sizes per element half:

  • Ref =       1.476
  • Driven =   1.446
  • D1 =        1.373
  • D2 =        1.345
  • D3 =        1.313

Performance figures @ 50.150Mhz:

  • Froward Gain: 10.74dBi free space
  • Front to Back: 23.48dB
  • 1:1.2 SWR B/W 500Khz

 

 

Dimensions in Metres - all tubing 12mm diameter, mail for other sizes and tapered elements

Element spacing:

  • Ref =      0
  • Driven =  .729
  • D1 =       1.223
  • D2 =       2.791
  • D3 =      4.405

Element sizes per element half:

  • Ref =       1.477
  • Driven =   1.447
  • D1 =        1.374
  • D2 =        1.346
  • D3 =        1.314

Performance figures @ 50.150Mhz:

  • Froward Gain: 10.74dBi free space
  • Front to Back: 23.48dB
  • 1:1.2 SWR B/W 500Khz

 

Azimuth Plot


 


Elevation Plot

 

 


This fantastic antenna at 10m 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!
 
 
 
 

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