A while a go i asked a couple of questions on this site about mounting a vertical yagi antenna on a metal pole. One of the answers given to the first question talks about using decoupling stubs to effectively remove RF current from a metal mast.
The answer says to place a half wave horizontal element at the junction between the boom and the mast, then place a quarter wavelength horizontal element down 3/4 of a wavelength along the length of the mast and parallel with the boom. This apparently creates a high impedance at the top of the mast and stops current flow down the mast.
That answer is confusing because when i think about a half wave dipole, the center is a low impedance, which is opposite to what is being suggested.
Can anyone give me some more information on this ? I'm not asking about all the other methods you can use to mount a vertical yagi, i'm asking specifically about using decoupling stubs in this manner to allow the use of a metal pole such that the radiation pattern of the antenna won't be affected by the mast.
I have looked everywhere and cannot find any information on this subject, any help would be very much appreciated.