On Sep 22, 3:13*am, Szczepan Bia³ek wrote:

Yes. But antennas are in resonance.

That is rarely true.

A naturally resonant antenna has zero reactance at its feedpoint. But
that is not a requirement for it to produce EM radiation efficiently
from all of the r-f current flowing on it.

The monopoles used by MW broadcast stations vary from 60 to 225
electrical degrees in height. Only a few of those heights are
naturally resonant.

Yet they all radiate nearly 100% of the applied power, because any
antenna reactance is offset by an impedance matching network at the
feedpoint.

RF