Antenna (radio)
Line matching at the radio

Antenna tuning in the loose sense, performed by an impedance matching device (somewhat inappropriately named an " antenna tuner ", or the older, more appropriate term transmatch) goes beyond merely removing reactance and includes transforming the remaining resistance to match the feedline and radio.

An additional problem is matching the remaining resistive impedance to the characteristic impedance of the transmission line: A general impedance matching network (an " antenna tuner " or ATU) will have at least two adjustable elements to correct both components of impedance. Any matching network will have both power losses and power restrictions when used for transmitting.

Commercial antennas are generally designed to approximately match standard 50 Ohm coaxial cables, at standard frequencies; the design expectation is that a matching network will be merely used to 'tweak' any residual mismatch.
combination:repeat_prompt, punctuation:no_comma, language:response_language[Spanish]