"Richard Clark" wrote
...
Symmetrical back and forth take place only in the simple equations.
In EACH wave the forth is stronger than back.

The intellectual product of a Stalinist education system.

"It was shown by Stokes that in a water wave the particles of fluid possess,
apart from their orbital motion, a steady second-order drift velocity
(usually called the mass-transport velocity)."

In all schools the second-order effects are neglected.
In Stokes time no radio. But the above apply to all waves.

You should start with the selfeducation.
S*