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1.2ghz helix

I am almost finished with a 16 turn helix for 1.2ghz.  I am not sure of what type of matching I should use.  Some of designs I have  seen use a flat tab on the first 90 degrees of the helix.  What size should it be?  Is there a better way?  I have a bird 43 with a 1.2 slug for tuning.
73 Bob W7LRD

"if this were easy, everyone would be doing it"
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