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I think I just "got it".... The reflected wave, in vswr, is traveling back down the same center conductor that the forward wave is traveling on.... Oh.. Not the outer ground braid of the coax... Although there could also, and very likely, be current present there as well...

Out of curiosity, was the match different with the 18'? A 22' section of coax would likely give you a different reading as well...there are phase angles within a length of coax..

That's pretty close to the electrical 1/2 wave point @27 MHz with 240 ultraflex... (15.185 ft) If you shortened the coax to 7' you would likely see a completely different swr... Antenna height above ground is also a factor.

I'm wondering if routing the coax through a thin metal tube approximately 2'.5" long chokes off reflected current? Application would be coax routed through a west coast style mirror bracket on a semi truck..

A physically shortened 27 MHz mobile antenna is never going to be 50 ohms at it's feed point when tuned to resonance, so there will be standing waves present... Choking off the reflected current at the feed point should eliminate alot of transmitter problems, I'm thinking... So, using a tuned...

If I understand correctly.... Coax length will not change feedpoint impedance, but it can transform this impedance.. If the feedpoint impedance is different from the transmitter impedance, then standing waves will be present, even though the swr "looks" low at the transmitter end, due to the...

As long as the phase angle is zero, I would think... (Electrical half wave feedline, both elements driven by same length line). Start using different phase angles and I would think this technique would not work...leading, lagging elements inducing different feed point impedances... As well as...