How to tune a 2 el Yagi or any parasitic array

I do some experiments in the workshop to explain mutual coupling and show how to easily tune any 2 el parasitic array in the field by just using the analyzer to sweep the driven element. 80m-40m Yagi paper: https://drive.google.com/file/d/1Iksv... 160m parasitic array paper: https://drive.google.com/file/d/1eVkl...