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if the thickness of the entire vertical on a 5/8 affected signal strength then the little wire in a imax would be killed by other 5/8 made of tubing . saying "how much material is used to make the top hat or cap hat"  implies that surface area can increase gain ....... it doesn't .


how can a tophat in and of itself be resonate on 27 MHz. without being quite a few feet across ? if it is resonate on 27 MHz why does it need a coil or shaft ?


some will say if you want maximum gain to eliminate any coils or tophats .