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Yes if you include the transmission line as part of the SYSTEM and it has always been that way. The "gotcha" part is as Doc and others have already stated (there goes that reading all the posts part again) is that changing the coax length will only alter SWR at (the shack end of the cable)  if the antenna is not a true 50 ohms.The antenna feedpoint impedance does not change regardless of how long the transmission line is. This changing of length affecting SWR thing is why people still ask how long their cable has to be between their radio and amp to get a good match. It is because their amp does not present 50 ohms to the radio and they are attempting to alter the SWR by changing the feedline length between the amp and the radio which works but is only a bandaid solution to a hemorrhage AFAIC.