Re: The mysteries of tuning a random wire


W4OED
 

As you know, long-wire antennas have a large inductive component. Some antenna couplers do not have the capacity to deal with such inductance and they rely on the operator to install the antenna coupler close to the radio. This way, the feedline should help it to deal with the extra inductance.
That is why antenna tuners for HF ship radios insert a capacitor in series after the tuning network when dealing with long-wire antennas. It is important to mention that such antenna tuners are always installed within three to six feet from the base of the antenna to avoid dealing with the feedline.
Regarding the counterpoise, I have seen great results when the counterpoise (about 1/4 wavelength of the lower transmit frequency) was installed a few inches about the ground, in line with the radiator, but OPPOSITE to it. This way, the counterpoise acts more as the other half of a dipole. It might be worth trying it.

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