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Indeed. The only time I've come across lengths of coax being critical is in a VHF/UHF repeater system where you have to use 1/4 wave and 1/2 wave length patch leads between the various cavity filters and isolators etc and with the harnesses on stacked folded dipoles because of the way it all works with phasing. On HF the only time I've come across where its critical is when you're using phasing such as in a steerable four square array.