Richard Harrison wrote:
Cecil, W5DXP wrote:
"A TDR will register reflections both from the feedpoint and the open
ends of the antennas."

Why reflections from the feedpoint if the antenna matches the feedline?

If the antenna is fed with 50 ohm coax, the antenna
does not match the feedline. The Z0 of a #14 wire
30 feet in the air is ~600 ohms. It takes a half-cycle
of sinusoidal RF for the feedpoint impedance to begin
to match the coax Z0, i.e. the feedpoint impedance of
a standing wave dipole is a virtual impedance that
doesn't exist until the first reflections arrive from
the ends of the antenna.

Before Reg died, he had something to say about that.
--
73, Cecil http://www.w5dxp.com