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I have never measured a run of coax for any band since 1965. I use what I have & I don't have any issues with my stations. I use quality LMR-400 for almost every run even in my mobile going to my Lil Tarheel HP. All of my antennas are resonant, so I don't need an antenna tuner either. If you need to change the length of the coax, then I believe there is an underlying problem not being addressed.