BJ, if you check the 2nd image I posted in my original post above, "G0KSC 6m yagi 50.15 mhz" and check the dimensions I posted on the 1st page, you will see one of Justin's models with a 20' foot boom, which he claims is about the optimum length boom for his OWA design.
The model shows very good gain at a low angle, almost perfect direct fed match, and pretty good rejecton from the rear.
If you prefer a beam with the features like CK posted, then try his design. He gives us his dimensions and the reason why he prefers to use the hairpin match and the balun.
I also did a model of CK's antenna, but I was not able to add the matcher or the balun...however it is fair for some to say...the model can be said to show dubious results in this regard, and due to these omissions.
The originator of this OWA design suggest, if folks want a different mix in their beam project...to contact him and he can help with the dimensions and design. I left the link to his website above.
Keep us posted on your progress.