Coax length has nothing to do with how well your radio will receive(rx) or transmit(tx) unless it is like 1000' and then you might loose a little. It will also not bring your SWR's down if they are too high. You should use just enough coax to make it from your radio to antenna or buy a prefab length close to what you need. The 17' or 18' lengths are just myths. The people behind these myths is BIG CB!. It is in the best interest of all companies involved in coax whether they are making it or selling it to tell you what lengths you should use, of course they are going to say you need 18' when on the average a usual cb install is 10'.
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