The Wide L-antenna is a shortened horizontal
dipole that can come close to having the gain and efficiency of
a conventional horizontal, center-fed dipole
The Tall L-antenna performs much like
a vertical but with some gain towards the side arm.
The Equal L- antenna is part- vertical
and part- dipole and can favor either type by changing the angle
of the side arm.
All three forms are suitable for limited space environments and have
a degree vertical and horizontal polarization which helps in both
local and long distance communication.
Wire Antenna Modeling Software
This study answers the questions
of what happens when you bend a dipole at different angles and
feed it at different points.
It is unlikely an average
amateur radio operator would have the time and resources to do
this study by building prototypes even if he had the desire. With modeling software a ham can do in a few
hours or days what would otherwise take weeks or months, if ever.
The results by way of software
reveal how the changes in an antenna affect frequency, impedance,
radiation pattern and other characteristics. Through optimization, modeling predicts the
dimensions and angles that will give the best SWR, Gain or Efficiency.
There is a catch. Modeling software lives in its own perfect
little world inside the computer. It works with the information
given. The more sophisticated the program and the user, the better
the results. In the real world we take guidance from the results
but understand there will be differences in materials, design,
construction, support structures and effects from near
Modeling eliminates dead-ends,
gives ideas and guides us to a working antenna.
McCoy, Lewis G., W1ICP, “A Limited-Space Antenna.”
QST Oct. 1960: pp. 23-25
“The ARRL Antenna Book.”
1974 –1997. 225 Main St., Newington, CT 06111
Cebik, L. B., W4RNL, “Whips,
Tubes and Wires: Building a 10-Meter L Antenna.” QST Dec. 1999
Cebik, L. B., W4RNL, “The L-Antenna.”
LaBarge, Craig, WB3GCK, “The `Up
and Outer` Antenna” www.qst.net/wb3gck/up_and_outer.htm
Buddipole, Inc. 3028 SE 59th Ct.
#600, Hillsboro, OR 97123
MFJ Enterprises, Inc., 300
Industrial Park Road, Starkville, MS 39759
SteppIR Antennas,2112 116th
Ave. NE, #1-5, Bellevue, WA 98004
“The ARRL Antenna Book”,
22nd edition, pg. 4.2.14
Free antenna modeling program
by Arie Voors.
From Dick: If you are interested in what
happens to a radiation pattern if you bend a dipole into an L,
or a V, U... side-to-side, up-or-down... zig-zag, meander,
off-center, elevated radials, etc...
my QSL website about Bent Dipoles is
the place to go. www/qsl.net/kk4obi
are over thirty variations on ways to put up a dipole in limited
space along with color 3D radiation patterns and details about
the change in radiation characteristics, gain/SWR/impedance/efficiency/resonant
modelers the 4NEC2 software models are
provided for each type of bent antenna. This allows an antenna
model to be adjusted
to represent your specific situation.