If I remember correctly, the original design of the G5RV does NOT use
coax. [If interested, check it out on Google.]
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Ian- Hide quoted text -

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I think you are right. Most of the commercial antennas called "G5RV"
have coax supplied with them or instruct you to attach a certain
length coax.

One of Reg Edwards programs, Dipole3 models a twin lead-coax miltiband
antenna. It also has a G5RV feature.

Gary N4AST