RG213 is always the best choice for both its lower loss and its also being structurally very strong. I would not use
or advise anything else myself - and on our current boat the builder put in an extra mast conduit as a matter of course purely
so 213 could be used.
But if using RG8X or the likes of LRM-195 then make sure you get a version with a multistrand
rather than single strand centre conductor (they both come with either) as will likely save you heartache later. Also be careful
that bend radiuses are not too tight with these and with how it is supported so immune from the possibility of crushing as
both have soft foam plastic dielectrics which the centre conductor can migrate through in a tight bend.
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