Dodge 2013 Journey - Owner Manual - Manual (Page 629)

INSTALLATION OF RADIO TRANSMITTING EQUIPMENT
Special design considerations are incorporated into this vehi-
cle’s electronic system to provide immunity to radio frequency
signals. Mobile two-way radios and telephone equipment must
be installed properly by trained personnel. The following must
be observed during installation.
The positive power connection should be made directly to the
battery and fused as close to the battery as possible. The
negative power connection should be made to body sheet metal
adjacent to the negative battery connection. This connection
should not be fused.
Antennas for two-way radios should be mounted on the roof or
the rear area of the vehicle. Care should be used in mounting
antennas with magnet bases. Magnets may affect the accuracy
or operation of the compass on vehicles so equipped.
The antenna cable should be as short as practical and routed
away from the vehicle wiring when possible. Use only fully
shielded coaxial cable.
Carefully match the antenna and cable to the radio to ensure a
low Standing Wave Ratio (SWR).
Mobile radio equipment with output power greater than normal
may require special precautions.
All installations should be checked for possible interference
between the communications equipment and the vehicle’s
electronic systems.