Keith Dysart wrote:
For convenience assuming the dipole is lossless, it seems
to me that after the transmitter is turned on, some of the
energy is stored in the antenna, but once the antenna
is charged, all the energy entering the antenna is radiated
until the transmitter is turned off, after which the energy
stored in the antenna is radiated until the antenna stores
no energy.

So everything that goes in to the antenna is radiated.

Before steady-state is reached, a considerable amount of
energy is stored in the standing waves following key-down
(your "charging" time). That energy stored in the standing
waves will not radiate until the source is disconnected,
e.g. after key-up.

A 1/2WL dipole is a standing-wave antenna. The energy
radiated from such an antenna is considerably less than
the energy stored in the standing-waves. The SWR on the
antenna is probably around 20:1.
--
73, Cecil http://www.w5dxp.com