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Donald, here is what I get when I compare my Big Hair 5/8 wave collinear to my Sigma 4 with a collinear .50 wave above.

 

[ATTACH]11343[/ATTACH]

 

I understand that this S4 does not work as this model indicates in you real world testing, but this shows me the collinear S4 is about the same as a full 5/8 wave collinear.