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Have you tried putting together the full setup at ground level to see if the SWR issue appears there?


Really just a process of elimination.


If setup works perfectly on ground but not on crane then something on the crane mounting has changed from previous installs that is causing the issue.


If setup has issue on the ground then you'll have to inspect each element to solve.


If it worked fine in previous crane installs but not this one and the mounting is exactly the same then something in the chain of equipment is having an issue. Personally I'd check coax first.