The other point I note is that he wants enhanced HF radiation between
10 and 4 degrees elevation and apparently beamed to a specific point
on the globe... The cubic size and the towers and the arrays that it
will take to accomplish this are not efficient in time, money, and
effort... He is chasing a unicorn...
As has been pointed out already, the percentage of time that the major
portion of the arriving HF EM wave is below 10 degrees can be
enumerated on the fingers of one hand... Besides, who is going to have
the array on the other end with comparable response?

denny / k8do

Dear Neighbor Denny:

1. One may have reasonably smooth HF radiation between 4 and 10 degrees
with a yagi that is a little over two WL (2.2) above ground (with a maximum
of about 7 degrees). The second null will be in the neighborhood of 14
degrees.

2. Many "DXers" exist who have antennas that even at 14 MHz are two WL
high. Money-efficiency is very much an individual thing.

3. Many years of dealing with arrival angles of HF signals from over 7 Mm
away suggests that such angles are mostly smaller than ten degrees. Larger
than 12 or 13 and smaller than about 2 degrees is unusual. With truly
serious antennas on both ends, as you have suggested, one might see 1 to 4
degrees.

4. Great to know that we are both still alive. It has been a long time
since we have talked.

73, Mac N8TT


--
J. Mc Laughlin; Michigan U.S.A.
Home:

"Denny" wrote in message
ups.com...
The other point I note is that he wants enhanced HF radiation between
10 and 4 degrees elevation and apparently beamed to a specific point
on the globe... The cubic size and the towers and the arrays that it
will take to accomplish this are not efficient in time, money, and
effort... He is chasing a unicorn...
As has been pointed out already, the percentage of time that the major
portion of the arriving HF EM wave is below 10 degrees can be
enumerated on the fingers of one hand... Besides, who is going to have
the array on the other end with comparable response?

denny / k8do