[Elecraft] Counterpoise vs ground wire ?

[Ron D'Eau Claire]

Note that Don said " RF Ground will be that point of zero RF voltage - in a
balanced dipole, it will be present right at the middle of the center
insulator." 

"Dipole" is the important word, meaning a radiator 1/2 wavelength long. A
full wave center fed antenna (two half waves in phase) will have a voltage
loop - high impedance point - at the center of the center insulator. 

As the center fed antenna is made shorter than a 1/2 wave, the impedance at
the center also rises. Think of it as "stuffing part of the antenna down the
feed line" to make up a 1/2 wave.

73, Ron AC7AC