Correction:

Roy Lewallen wrote:

This isn't quite correct. A standing wave is the result of isn't the sum
of traveling waves. It's a description of the envelope of the current
distribution that sum produces. . .

It should read:

This isn't quite correct. A standing wave isn't the sum of traveling
waves. It's a description of the envelope of the current distribution
that sum produces. . .

Roy Lewallen, W7EL