[TowerTalk] 15 meter yagi height for 6000 miles

[Bryan Swadener]

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.
> 
> Bob
> K6UJ

Hi Bob,

6000 miles must be wrong -- did you mean km?  I'm 3728 miles
from KP.  If you're near 38N/122W like qrz.com shows, you're
closer (3600 statute miles) to KP (18N/66W). 3600 mi = 5800 km.

vy 73,
Bryan WA7PRC