You are using the ubiquitous jargon of radio engineering. But for those on this site who are not radio engineers: of course the impedance of the custard does no

You are using the ubiquitous jargon of radio engineering. But for those on this site who are not radio engineers: of course the impedance of the custard does not change. The impedance of the system including the custard and the antenna tuner is different – and better for the radio to work with — than the custard alone.