The performance of a G5RV as a multi-band dipole, because of its
length of coax feedline, is somewhat worse than any other random
length of dipole fed with a random length of feedline of random
impedance.

Remove the coax, bring the feedline all the way back to the shack, and
the G5RV is just as good as any other simple multi-band,
multi-directional antenna.

As with other random length antennas a tuner is always useful.
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Reg. G4FGQ.