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While I agree that a full Kamm-back is the ideal solution, I don't currently have the material to build one, while I have enough scraps lying around to build a VG array like the one used on the Evo... It just consisted of 30x60mm triangles(about the thickness of coroplast) fixed four inches apart, and four inches from (ahead of) the flow separation, and at a 15* angle compared to the airflow, eight in total(plus the antenna)...
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