Sep 15, 2002 · The 10-80 meter groundplane vertical antenna is a rugged multiband vertical antenna, That is 43 feet in height. This vertical antenna has no lossy traps or coils to burn out.Super wide bandwidth means more time operating ,and less time stuck on a frequency your trap vertical is tuned for. An NEC model of a so-called OCF vertical dipole 'flagpole' antenna capturing the key elements of the construction does not support the proposition that it is a vertical dipole in nature, in fact the current distribution is very similar to that of a short grounded monopole. For VHF/UHF, I use an indoor home brew ¼ wave dipole.
The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching Section of balanced feed line. The Matching Section is 450 Ohm Open Wire Feedline and is a compromise impedance between the 5/8 Wave antenna elements and the feed point, A 4:1 Current Balun. Both types of antennas are world renown for their unique characteristics in the 40 meter and 20 meter bands. There is even a 17 meter DX version available from some suppliers and homebrew designs are online. Vertical antennas and the Balun So what about the vertical antenna? Does it need a balun? The short answer is no. But it is more involved ...
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