The spacing isn't critical, and the impedence change between 4" and 6"
spacing isn't very much. I use #10 wire with 2" spacing on mine. I chose
that spacing because that's the length of the E F Johnson ceramic spacers I
had on hand at the time. I wouldn't recommend anything greater than 6" for
frequencies above 30 mc/s, though, because the spacing begins to become more
than a negligible fraction of a wavelength, causing the line to mimic two
closely spaced elements, and radiate.
Don k4kyv
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