Unless you are on totally flat ground for miles around you'll need to run the
Microdem program to import your exact location into HFTA to actually get the
correct gain and take off/landing angle info along with the predicted historic
DX angles that work.
Without knowing how your local terrain affects the theroetical antenna height
you won't have much to go by!
I can send you some examples of my QTH if you'd like -- tribander at 50' with a
225' drop-off to the East. .
John NA6L
-----Original Message-----
From: Bob K6UJ <k6uj@pacbell.net>
To: Towertalk <towertalk@contesting.com>
Sent: Thu, Mar 1, 2012 4:46 pm
Subject: [TowerTalk] 15 meter yagi height for 6000 miles
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
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