Frank and all,
While it is true that radiation off the end of a long wire is a deep
null, The maximum radiation will be at an angle to the wire greater
than 1/2 wavelength (less than 90 degrees). That angle will depend on
the length relative to wavelength.
A look at the radiation pattern of long wires and other Traveling Wave
antennas will reveal that fact. The rhombic antenna and V-beams use
that characteristic for their gain and directionality.
73,
Don W3FPR
On 1/10/2018 11:40 PM, [email protected] wrote:
Ron,
What you've come to understand is absolutely false except for the
special case of a long wire close to the ground. That special case
is called a Beverage antenna that radiates vertically polarized
radiation off the ends.
When you raise a long wire antenna more than about 0.05 wavelengths
above the ground, horizontal polarized radiation becomes dominant
and the radiation pattern always has a deep null off the ends.
73
Frank
W3LPL
----- Original Message -----
From: "Ron D'Eau Claire" <[email protected]>
To: "Elecraft Reflector" <[email protected]>
Sent: Thursday, January 11, 2018 4:08:40 AM
Subject: Re: [Elecraft] Long wire antennas
Understand that a true "long wire" (greater than 1 wavelength) starts to be
directional off of its end (if fed at one end, that's the opposite end).
73, Ron AC7AC
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