"Reg Edwards" wrote:
As I said, 1/2-wave antenna input impedance is a function of conductor
diameter. It is not a relatively fixed value (around 36 ohms) as is a
1/4-wave vertical.
_____________________

Terman's chart, which I scanned and emailed to you, shows a 1/4-wave
vertical with an ~R of 31 ohms to 48 ohms, and ~j of -15 ohms to -40 ohms
for the five MW towers. This range actually is about the same by % change
as shown for the 1/2-wave radiator (~R of 300 ohms to 450 ohms, ~j of -100
ohms to -350 ohms).

Maths takes precedence over measurements. Without maths,
experimenters flounder about in the dark.

Both techniques should give about the same results, when both are done
correctly.

RF