I don't so much want to know more about the theory of impedance, as its practical applications. I would like to learn more. Some examples. I take an older cell phone antenna (from 5 years old technology) and I want to use it to work on my scanner or my CB receiver. I take a couple of dual end alligator clipped wires and connect it up as best I can. I get the distinct impression that I am losing signal strength...cause the impedance don't match up. I'm thinking that electronics hobbyists or technicians know how to best make such things work. That perhaps they immediately resort to "jumping" some sort of inductor coil or resistor either in parallel or in series, to closely match impedance. That they likely know to do this (what to use and where) from years of past practice?