I had overwhelming feedback on my article about 160 m spitfire installation at UA2FW's for the CQ WW CW 160m DX CONTEST 2021 ( https://dxnews.com/ua9ba-spitfire-160m/ ). So, I got hooked on the spitfires myself and continued evaluating the antenna's behavior under different conditions. In this article I describe few construction ideas for 80 meter spitfires and provide the MMANA files for your own evaluation. I hope the material will help you to design on your own spitfire antennas.
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UA9BA 80 Spitfire antenna