Percy Picacity wrote in
:

However, this does not change the fact that standing waves do not 'use
up' any of the power fed to the aerial

Is that like potential vs kinetic energy? After all, a filter could be said
to 'store' energy in an eternal oscillation if it had no losses, and nothign
drawing output from it. The moment you do, you lose energy, the 'note' fades.

Given that if you produce a standing wave in a tank of liquid such that one
bulge exists above the rim, the standing wave can be considered a form of
storage (potential energy), because that tank will hold more liquid that it
would if brim full without the wave.