Hello Jeff, interesting thinking you have going here. Have struggled with
that concern at this HFN Ale Pilot station for some years.
What I ended up doing with a single HF antenna installation at my QTH, as in
most things, is a compromise for NVIS and getting outside the country.
Supporting the scanning of select frequencies on 10-80 meters and linking to
stations locally (nvis less than say 300 miles or so) and the rest of the
world was a challenge. Not to mention my high interest in 160 meters ... hi
hi After about eight years of using an antenna installed low to support NVIS
at this QTH, and comparing to a previous QTH using a similar antenna but
installed higher, I have been pleasantly surprised.
The antenna is a horizontal off center feed Windom antenna. The one used in
Michigan was home brew 10-80 version using twin line feeder line and mounted
between trees at about 45 feet. The Caroline Windom used here in Indiana is
a 10-160 meter 260 feet long commercial version installed using coax with
the center about 15 feet high in the center, and the ends sloping gradually
up to the tree supports at about 25 feet up. The end result is that with the
many lobes of such a long antenna, the 10mhz - 30mhz see lower angle that
support the world depending on propagation, and the 40-160 (especially 80
and 160) see decent NVIS performance.
Have had stations ask me how I get regular digital mode contacts out of
Europe, but put out the strong signal on the lower bands. This antenna was
the answer .... but I do have to be careful of storms as I dont want front
The antenna installed here now is from Radio Works:
though of course you can build your
Plan other antennas after I get to the retirement QTH ... and not the one
that already has such high elevation you cover the universe from the top
side of the clouds .... HI Hi hi
73 from Bill - WD8ARZ
----- Original Message -----
From: "Jeff - WA4ZKO" <wa4zko@...>
Sent: Sunday, July 18, 2010 6:40 PM
Subject: [BPQ32] Time to think NVIS for these close in backup HF links?
> NVIS anyone?