"gareth" wrote in message
...
"Steve" wrote in message
...
Probably proportionately more will be lost as heat as a very short
antenna will be a low impedance, therefore current, driven job and I sq*R
losses within the antenna will play their part. Apart from those
additional losses, it should radiate all that is left,

Some will be radiated, but in a short antenna, much less than with a
long antenna. That which is not radiated will reflect, or bounce off the
end and arrive back at the feed point.

If the short antenna is a dipole, then the two reflections will be
considerably out of
phase, resulting in vector cancellation, which will also contribute to
reduced
efficiency of radiation.