>
> and feed it on the side for vertical polarization and you
> would be creaming tribanders at 3x height.
>
Fed on the side for vertical polarization, the quad (or any
vertically polarized antenna) loses the "ground gain."
On 20 meters over perfect ground:
A horizontal dipole at 35' shows 7.33 dBi at a 27 degree
takeoff angle
A vertical dipole with it's center at 35' shows 0.96 dBi
at a 13 degree takeoff angle
At no vertical angle does the vertical dipole outperform the
horizontal dipole at 1/2 wave above ground. The Quad may be
a fine antenna but I would go for a good, modern yagi (the 3
element SteppIR or one of the Force-12 C3 variants).
73,
... Joe, K4IK
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