[TowerTalk] Measuring voltage along an element

[Andy]

As a first approximation, the voltage (and the current) should both
vary sinusoidally along the length of any straight thin antenna.  The
current approaches zero at the ends and maximum one quarter wavelength
back from the ends; the voltage does the opposite.  Of course the
voltage doesn't reach zero 1/4 wavelength back because that would mean
a zero impedance at that point.

The trick is knowing just how large the voltage gets near the ends, or
wherever you are supporting the elements.  I don't know.

The impedance varies considerably (by orders of magnitude) as a
function of position on the element.

Andy