MFJ-1778 G5RV Multiband Antenna
3
160 meter band:
The MFJ-1778 (G5RV) can function as a top loaded vertical antenna with the dipole element acting as
a capacitance hat on 160 meters. Operation on this band requires a ground screen or radial ground
system (see the INSTALLING and OPERATING THE ANTENNA section). The radiation pattern of
the antenna is omni-directional and vertically polarized on 160 meters.
Caution:
On 160 meters the feedline conductors must be tied together and fed in parallel. As an
alternative, either the shield or the center conductor can be fed with the opposite terminal unconnected.
DO NOT try to operate this antenna as a conventional dipole on 160 meters.
Tools And Time Requirements
This antenna requires no assembly. The time needed for installation will vary with your skill and
equipment.
No special tools are required to install this antenna. Nylon ropes are needed to support the ends of the
antenna from a suitable structure or tree. If a tree is used, you will need a way to get ropes over it. The
most common method is to use a weighted arrow or a fishing rod and a heavy sinker to place a small
line over a tree. A larger line is then pulled up and used to pull the support rope over the tree. The
ARRL Antenna Handbook has detailed suggestions for installing wire antennas.
Safety Precautions:
WARNING:
-
This antenna is an electrical conductor. Contact with power lines can result in death or serious
injuries. Do not install this antenna where there is any possibility of contact with power cables or the
service drop. The antenna should not be close to power lines during installation, operation, or
removal.
-
Follow the guidelines for antenna installation recommended by the US. Consumer Product Safety
Commission.
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Keep this antenna out of reach of adults, children, and animals.
- Any contact with this antenna while transmitting can cause RF burns.
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Never place this antenna close to electric power lines or utility wires.
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Install the antenna away from living areas to reduce levels of electromagnetic fields
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Never operate this antenna near RF sensitive medical devices such as pacemakers
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Keep the ladder line away from buildings or metallic objects. Ladder line is a high impedance line
that may develop high RF voltages with high transmitter power levels.
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Use a minimum of 50 pound working load weather resistant rope to support the tension and wind load
of this antenna.
