[Elecraft] Elecraft: Z Match tuner

[Ron D'Eau Claire]

Don is right, about needing 1/4 wave of feedline (or an odd multiple
thereof) so it will act as a transmission line transformer to convert a high
impedance at the antenna to a low impedance at the rig. But that also
requires a high impedance feed at the antenna. That is, an antenna 1/2 wave
length or a multiple of 1/2 wavelength long. The true Zeppp is, in reality,
a single-band antenna! 

His suggestion about just running a single wire is "spot on" in my book.
You'll want to arrange a counterpoise (either tunable for a 1/4 wave long
wire for each band). With a good, long wire like you have it won't be hugely
important as far as the efficiency of the antenna is concerned, but it will
serve to keep the rig at RF ground!  Indeed, the nearer your antenna is to a
multiple of a 1/2 wave on each band, the more efficient it will be.

Ron AC7AC