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An adjustable 450 ohm line for fine tuning and optimizing a 10m parasitic element of any directional
Telescoping brass tubing allows rapid lengthening or shortening of the total electrical length.
Works on Quads, Yagis, Delta loops etc.
This will tune as a 1/2 wave line from 27.8 to 29.0 Mhz.
Using this method one can optimize an antenna for max front/back or forward gain while safely standing at ground level.
Most amateurs who build antennas use formulas or computer programs to determine element size but never take the time and effort to adjust their antennas for maximum performance.
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This was shared with me by my friend NE2Q Jay Kolin