Good points, Bob. And ... errrrrrrrrrr ... no, not exactly .... I know
it is 20+ feet above the ground, so far so good. We are moving 500 miles
from our present QTH, and I didn't have a ladder to get to the attic
opening when we were shopping for a house. I do know that outside, I'll
have a flagpole antenna ... maybe a short wire, but it will have to be
modest.
The attic length less than 44 feet, that I do know, so the non-resonant
dipole isn't a great choice, unless I let the ends droop a bit. I do
have a "slinky" dipole that may find its way into the house attic or the
garage attic (12-15 feet AGL).
I know that part of the house has cathedral ceilings on the upper floor,
so I'll just have to have a look and see if I can snake some wire over
that area and keep it clear of electrical stuff.
I just wondered if there was a magic number for a non-resonant loop. My
thinking is that I could get enough wire up there for a 40-meter loop.
And, even if I had to double back in places, it would still work
reasonably well. I'll probably feed it with ladderline b/c it will be
non-resonant at a number of the frequencies I plan to work. Then, let
the tuner take care of the rest.
73, gene KC0RXY
Robert Tellefsen wrote:
Gene
Can you tell us what linear dimensions your attic would have
for potential dipoles?
They also work at nonresonant lengths, and work quite well.
At frequencies above their resonant length they can actually
contribute some gain. Height above ground will be a bigger
factor, in that for freqs below the resonant freq, you will
find your major lobe pretty much straight up. But it will
be a fat lob, and work out to a distance as well, just not
as well as a dipole up over a quarterwavelength on the band
in use.
73, Bob N6WG
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