On 20 Nov, 10:58, Cecil Moore wrote:
Richard Harrison wrote:
Kraus says:
"The currents on the transmission line flow out on the antenna and end
there, but the fields associated with them keep on going."

Actually, in a standing-wave antenna, such as a 1/2WL dipole,
the antenna wave currents bounce back and forth between the
open ends and the feedpoint. If there is not a Z0-match to the
feedline at the feedpoint, some of the antenna current reflected
from the open end of the antenna leaks back into the feedline and
makes it's way back to the source. A TDR will register reflections
both from the feedpoint and the open ends of the antenna.
--
73, Cecil http://www.w5dxp.com

An antenna I played with years ago was a sample of this search
by current flow. It was a dipole where the center was a closed
loop.The low current curve stated at the end of the dipole
and moves to the loop where it will circulate
until the match is right for it to travel on to the other end
of the dipole to achieve a low current point which is required
for resonance.
The machanical analogy of this is a mechanical rotary
pump where it deals with shear and cavitation of water flow.
But I don't think that is what Roy was alluding to as much
as it was a failure of understanding with respect to current
and voltage phase.
But I will have to wait and see what Roy meant.
Regards
Art Unwin KB9MZ....XG