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No, antennas are tuned by lengthening it or shortening it to a specific frequency or with yours, by adjusting the tuning rings.


If a coax length tunes your antenna significantly different, than there is a problem elsewhere. Use whatever lengths it takes to make the connections plus a little extra for future changes.


I used to buy into that stuff too about coax lengths being in multiples of 3 only and jumper cables can't be longer than 3 ft.