[Antennas] Re: [DX] would vertical be better than yagi?

Sat, 15 Jun 2002 07:23:07 -0700

There has always been a rule regarding antennas. It's the same
rule for flying airplanes.

"It's the amount of air UNDER it that counts, not the amount of
air above it."

And now the military comes along with the NVIS antenna. 
The NVIS is a low 1/4 wave antenna close to the ground, and works
best on 7 and 5 mHz.
They provide great coverage for a radius of about 200 to 500
miles.
That's why a G5RV on forty does such a great job. (At least MINE
does)

Ron C.

===========================================================

Merv Stump wrote:
> 
> > I recently put up a 2 element triband yagi (full size
> > tribander) but it is not up very high-maybe 25 feet or
> > so.
> 
> John, over the years I have settled on a personal rule of thumb of 5/8 wave
> length.  If a yagi can be placed 5/8 wave length above ground it will
> perform.  For 20meters this means you need to be about 40 or 45 feet.  If I
> could place it this high or higher, I would not consider the vertical.
> However, in my opinion if it is only 25 feet up, the vertical will out
> perform it on dx.
> 
> Regards, Merv
> 
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