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I've posted this in the past, and as we seem to be putting a lot of links to good info here I think this fits... A good visual of how feed line and antennas work. Feel free to skip to the 6:42 mark to get right into the demonstration.
"We know from elemental transmission-line theory that a transmission line is made up of a number of tiny distributed series inductances and shunt capacitances, so it should not be surprising that we can adjust the electrical length of a line of a given physical length by adding lumped inductances and capacitances." ~ M. Walter Maxwell, Reflections ~
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