The portable-antennas.com site is a must have when you want to build a wire antenna. It takes into account all the factors that affect the lengths of the wire for many common wire antennas e.g. height of each attachment point, soil type, diameter of wire and its insulation, feed point, distance from end poles and much more. It is all in metric so no need to convert to feet and inches. Very impressive.
Types covered include normal or linked dipoles, off centre fed, end fed, vertical, delta loop, half square, Moxon and a general section.
It’s well worth a look. I’ve put a permanent link to the site in the Links page too as posts gradually disappear into the archives.
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