The 'ZigZag' Vertical Beam Click here to go back to the home page

Brian Williams, GW0GHF

As there is little news this time, perhaps during the winter nights six metre enthusiasts might like to experiment with my ‘Zig-Zag’ four-element vertical for lofts.

All you need it some stranded ‘hook-up’ wire, wooden (or plastic) battens as supports and a 102 inch (2.59m) length of 450 ohm ladder-line. It is basically a two-wavelength wire formed into a close-spaced array with all the ‘elements’ driven. The antenna is fed by a Zepp-type transformer but it should be possible to feed it from the low-Z point via a gamma-match, although I haven’t tried it.

The diagram at the bottom of page 7 shows the aerial and a suggested method of rotation. The boom-length is five feet (1.5m); nylon cord can be used to suspend the wire from the top parts. Space the vertical elements as far apart as the wire will allow (about 20 inches/50cm) but the total wire length MUST be 36 ft/11m for 50.150 MHz. Try to keep the elements aligned and all at the same height.

Mine appears to work well and I estimate the gain to be around 6-7dB over a dipole. But it is useful in all directions, the polar diagram seems pretty ill-defined - at least in my loft!

The 'ZigZag' antenna

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