[TowerTalk] BIG WIRE BEAMS FOR 75 METERS

[Cqtestk4xs at aol.com]

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 at 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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