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Someone with more information on CB history can better answer that one. It could be that somewhere in our past there was a compelling reason to sell 18' of coax.

It is a convenient length at 11m if the VF is .66 because it includes a 1/4 wave transformer within its length. In some installations this may be helpful. A co-phase harness for example.

Unfortunately that doesn't explain why RG8X is that length. Did marketing gurus latch on to that length because they could sell more coax that way? Who knows? Maybe they hired the hot dog bun marketing guy to figure out how to sell more coax.



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