I used to run horse races against W4AN around 2000. He used a 4 square
and I had a 4 el quad loop at an average height of 120 ft. No contest. Quad
was always better by as much as 2 S units to EU. Get it high and it will
always beat a 4 square.
Bill K4XS/KH7XS
In a message dated 7/16/2013 9:11:10 P.M. Coordinated Universal Time,
richard@karlquist.com writes:
Joe Subich, W4TV wrote:
>
> > 3. Yagi's need to be a half wave high to really play,
> > but they may still hear OK at a lower height.
>
> The crossover point between a dipole and vertical is actually
> about 0.4 wavelength. A Yagi will have a slight advantage over
> a dipole because of the slightly reduced (ca. 3 dB) radiation
> up/down.
>
> > 4. Verticals with a good ground system are as good
> > as Yagi's for transmit depending on your ground conductivity.
> > Fortuitously, I have very high ground conductivity, but
> > of course YMMV.
>
> Verticals suffer an automatic 6 dB penalty because of the lack
> of ground gain. Yes, a vertical does very well in the ground-
> wave region - better than any high dipole/yagi. However, once
> the dipole/yagi is above 0.4/0.35 wave (100 feet/30 meters) the
> horizontal antenna has better radiation at all take-off angles
> in its "forward" direction than the vertical (vs. dipole) or
> 4 square/vertical beam (vs. yagi).
>
> 73,
>
> ... Joe, W4TV
At least at my QTH, for transmit purposes, a 75m dipole at 130
feet is equal to a 1/4 wave ground mounted vertical for DX. At lower
heights, the vertical is better. This is by comparing real
signals on the air. YMMV.
Rick N6RK
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