In article , kristoff
wrote:

In essence, the goal of an antenna-tuner is to do impedance-matching:
match the impedance of an antenna at a certain frequency to the (50 ohm)
output impedance of the transmitter and the transmission-line. For that,
it uses inductors or capacitors. (although I know that these components
do also have a resistive part, but I think we can ignore this here)

Kristoff-

Are you over-thinking this? The power is lost in resistance. For a
great mis-match, currents might be very high in the tuner.

Suppose you have a lousy antenna where 50 percent of your power is lost
in the transmission line and tuner. Anyone listening to you would
suffer a 3 DB reduced signal compared to the ideal antenna. That is one
half S-Unit. They probably would not know the difference.

Also your lousy antenna may have a poor pattern, transmitting your
signal in the wrong direction. The tuner can not fix that.

Fred