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Robb,


Some manufactures do isolate the driven element from the rest of the yagi.


Mosley, Cushcraft, to name a couple. Direct feed and may or may not use hairpin or beta matching.


The reflector and directors are all plumbers dream, ease of construction, design, or whatever reason.


 You may want to research a moxon antenna. It gives you an idea of totally isolated elements and performance. I have never built one, but some friends have. They swear by them on 6 and 10 meters for light weight, small area with full performance.