[TowerTalk] low band antenna without good ground
Michael Goins
wmgoins at gmail.com
Thu Sep 22 17:08:39 PDT 2011
You could also consider a half square arrangement.
mike, k5wmg
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On Thu, Sep 22, 2011 at 7:06 PM, Tony Brock-Fisher <barockteer at aol.com>wrote:
>
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> A delta loop is an antenna for the low bands that has vertical polarization
> but does not need a good ground. An equilateral triangle, apex up, fed 1/4
> wavelength from the top, will give vertical polarization. The bottom leg of
> the delta loop can be only a few feet off the ground, and it provides the
> 'ground return' for the antenna. The impedance of a single loop is around
> 100 ohms and can be matched with an electrical quarter wave of 75 ohm coax.
>
> A pair of delta loops can be phased for gain similar to a four-square. I
> have this antenna for 80 meters with no radials on the ground. Guest ops
> always remark about how well it plays.
>
> -Tony, K1KP
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