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007, I think it is possible that Sirio shortended the Vector and lengthened the radials trying to see if they could improve the durability and not loose much, if any, advantages compared to their 3/4 or longer wave. Maybe a couple of feet less at the tip would stop a lot of complaints with customers. IMO, they did suggest this, but I could be wrong however.

 


 

According to my modeling of the Vector, I think it shows the shorter Vector shows a bit more gain at even a little shorter than the 3/4, but that is modeling not real world. I'm not sure what I did about the length on the radials, but I think I left them like the regular Sigma4 and they might should be made longer like the New Vector.

 

Bob experience shows the longer Vector is best near 7.8 wave. I'm not sure what he did about the radial length.