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"The guy flew hot at me saying that's a bunch of bunk and that he's been using the 18' multiple for 30 years."

Well, sounds like he 'defined' himself, doesn't it?  Been doing it wrong for 30 years and proud of it! 

Using any coax cable of some particular length is only beneficial in particular circumstances.  Those circumstances deal with timing/phasing or resonance for some reason.  All of those thingys are frequency specific, one size does NOT fit all.  It may certainly work well on one channel, but it's benefit decreases as you move away from that channel.

Nothing new in the above, it's just said a little differently than before.  It's been a fact for a very long time, but that 'magical' length sells coax!  Imagine that...

 - 'Doc