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SWR is not equal to efficiency. You could have significant co-ax losses and that would show a low SWR. If you change the length of the co-ax and the SWR changes then this will confirm you had low SWR because of co-ax losses.

Also a lot of these multiband short antennas rely on a very lossy matching section to present 50 Ohms at the feedpoint.

[QUOTE="M0GVZ, post: 376750, member: 22312"] SWR is not equal to efficiency. You could have significant co-ax losses and that would show a low SWR. If you change the length of the co-ax and the SWR changes then this will confirm you had low SWR because of co-ax losses. Also a lot of these multiband short antennas rely on a very lossy matching section to present 50 Ohms at the feedpoint. [/QUOTE]

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