[TowerTalk] 15 meter yagi height for 6000 miles

[Jim Lux]

On 3/1/12 4:45 PM, Bob K6UJ wrote:
>
> Has anyone used the HFTA program and can tell me the best height for a 15 meter yagi for 6000 miles.
> Assuming there aren't any hills obscuring the take off angle.
>
> The carribean is about 6000 miles from my qth and from experimenting I have noticed that lowering the beam
> down from 90 feet down to 50 feet it is markedly better for 15 meters.
>
> I just bought the new antenna handbook and plan to dive in and learn how to do the HFTA myself but was
> hoping someone else had an idea of the best take off angle angle for 6000 miles on 15.
> I believe 50 feet is about 3/4 wavelength high and gives me a 20 degree takeoff angle on 15.
> Hope this all makes sense, hihi.
>

There's some example charts in the Antenna Book that might work for you. 
  Pick another path that's of comparable length and see what it says. 
Europe is about 6000 miles from 6-land, isn't it?

What you need to look at is the arrival angle statistics, and there's 
charts for that.