So i’m missing probably something elementary. I get how gamma match does the matching thanks to some resources i found.

There’s a claim of gamma match being an balun, and gamma-matched yagis or dipoles are often connected in the middle to boom or some kind of metallic support. Why this works? Why current would go to the other leg of dipole, instead of boom or external surface of coax? Wouldn’t that skew radiation pattern for dipole or introduce radiation polarized along the boom for yagis?

I assume the same explanation that works for gamma match would also work for half folded dipole, but i’ve not seen it bonded to the boom when used in yagis. (Maybe it’s because these things are uncommon)

edit: more links