Cecil Moore wrote:

We would make a measurement of either the forward or the reflected
traveling wave, which are phase delayed along the antenna.

I'm sorry, but that is a false statement. Measuring the forward
or reflected traveling wave, which is less than 10% of the
total energy on the antenna, is exactly what is the problem.

Hmmmm. Perhaps I misspoke. I should have said that's what I usually
measure when I want to know how much power my antenna is radiating. I
guess I don't actually know for sure what other people usually measure.
But if they have a Bird wattmeter for example, that's what they usually
measure too.

ac6xg