Keith Dysart wrote:
Q5."If no charge crosses the mid-point, then how do the pulses, made up
of charge, pass the mid-point?"

Radio waves propagate through empty space. No charges are needed for
propagation, but a wire contains free electrons which are urged to move
in-synch by a passing wave. That does not mean they migrate. In the
wire, electrons go nowhere fast. Their motion is mostly in-place. It the
energy which is traveling, not the electrons.

Best regards, Richard Harrison, KB5WZI