[Antennas] Antenna Height for 12 or 15 meters

Wed, 24 Mar 2004 21:45:31 -0800

I did some A/B experiments comparing 15 meter inverted
vee's at 30 feet and 60 feet.  In general, there
is a substantial improvement in performance at the
greater height.  Also, I am in a rural area in the clear.
In a city, the lower height would be additionally handicapped
by surrounding buildings, etc.  

Rick N6RK

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of John Geiger
> Sent: Wednesday, March 24, 2004 7:56 PM
> To: [email protected]; [email protected];
> [email protected]
> Subject: [Antennas] Antenna Height for 12 or 15 meters
> 
> 
> Maybe someone on the reflector has antenna modeling
> software and can help me, or maybe they just already
> know the answer.
> 
> Here is my question.  I have thinking of going to a
> monoband yagi for either 12 meter or 15 meters. 
> Really like those 2 bands, and yagis aren't too large
> for those frequencies.  It would probably be mounted
> on a tripod on the roof of the house, which is where
> the current antenna is.  This would get it about 25
> feet or so above ground, which is over a half
> wavelength for both 12 and 15 meters.
> 
> It seems to me that 1/2 wavelength is the magic height
> to get a yagi to perform.  Is that correct?  How much
> better would it perform by going to 40 or 50 feet? 
> Would it adequately perform at 25 feet, having a
> decent angle of radiation and such?
> 
> 73s John NE0P
> 
> 
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