[Antennas] Newbe with First Question

[Harvey&Bessie]

johnkin wrote:

> Greetings to the Group,.
>
> This is my first time on here so I hope you all understand my 
> question. I have recently built a G5RV Jr. that I plain on using 
> portable. I have a 21 foot mast that is very easy to set up and take 
> apart. The length on each side of the antenna is 26 feet and I have an 
> extra 40 feet of rope, to add on each side. Each side will be tied to 
> a stake, Making it a very shallow inverted Vee.
>
> My question is this. At what point does an antenna turn from an 
> Inverted Vee to a somewhat flat antenna? Is there a gray aria between 
> 120 degrees and 180 degrees?
>
> I have heard some say they have a drop of 10 feet or a bit more and it 
> seems to work out just find. So this is why I ask the question.
>
> I am looking forward to your replies.
>
> John Kinnunen
> KB0ADD      
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>
Johnkin, the main reason that the inverted vee antenna was more popular 
than the "flat-top" dipole originally was purely mechanical the ends, 
being at a lower hight than the middle, one could use less expensive 
means of support for the ends. It was soon discovered, however, that 
there was another advantage. The purely horizontal version of the 
half-wave dipole had very deep nulls off the ends of the wire. By using 
the inverted vee configuration, a vertical component was added to the 
horizontal radiation pattern, which tended to fill in those nulls and 
the antenna performance was more omni-directional. Of course the steeper 
the angle, the more vertical component you add to the radiation pattern 
and the more those nulls are filled in, this is especially true when the 
antenna is operated on harmonics, or with a tuner, on higher frequency 
bands, where there are multiple nulls which become very troublesome in 
the "flat-top" configuration.
    I hope this explanation helps.
    73,
Harvey/W4TG