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On that page Jerome liked, the author Phill links to a good YouTube video by Shango66 that shows the process for making a tuned dipole.
The formulas for it assume you are matching to 50 Ohm coax instead of the 75 Ohms that the blonder tongue and most cable and consumer TV gear uses. He uses an expensive SWR meter to tune the antenna for 75 Ohms but you can get the same result without it....
From my college antennas elective Iearned that the formulas for 50 and 75 Ohm dipoles have a linear relationship such that if you calculate the percentage of the calculated length shango had removed at the end, then remove the same percentage of length from an antenna of a different channel you will get the same correct tuning.
I've been using that method and I can transmit a block with my AM 60 on CH7 at full power.
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