Specifications

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The horizontal quad loop is a groundless antenna for high angle radiation and is ideal
for HF communications from zero to 500 miles in the frequency range of 2 to 10 MHz.
This configuration provides optimum near-right angle reflection to the ionosphere for
short range communications.
A square base can be from 8 to 15 meters long and can be configured to the shape of the
structure as necessary, to provide the best arrangement. The height of the supporting
poles should be 20 to 40 feet. Supporting poles should be as tall as possible to provide the
antenna with the greatest isolation from industrial noise generated by the building,
such as fluorescent lights and electrical motors. Loop antennas are also less suscepti-
ble to industrial RF noise generated by the building, because they are isolated from the
ground system of the building.
Loop wires are attached at one end on the high voltage active side of the coupler and on
the other end at the ground side of the coupler.
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© 1998 SGC Inc
SG-235 Manual
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USA
P.O. Box 3526, 98009 Fax: [phone] Tel: [phone] or 1-800-259 7331
E-mail: [e-mail] Web site: http://www.sgcworld.com
Base Quadra
Loop Horizontal
Porcelain
isolators
with tie rope
Ground
bolt
terminal
Antenna
terminal
Radiation
50 ohm
coax from
transmitter
Coupler