The trick I use is to make my 75 ohm feedlines a
multiple of 1/2 WL. Of course on 160M that can
result in inconvenient lengths.
Another trick is to match the antenna to 75 ohms.
Then you have NO SWR on the CATV feedline and 75 ohms
at the transmitter regardless of the feedline length.
75 ohms results in a 1.5:1 SWR for a 50 ohm system and
is pretty easy to match for most radios / amplifiers.
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