Uniden UM425 Guide D'utilisation page 49

Installing the Hardware
Connect the BLACK wire of the included power cable to the
1.
NEGATIVE (-) side of your power source.
Connect the RED wire of the included power cable to the POSITIVE
2.
(+) side of your power source.
Connect the power cable to the power connector on the back of the
3.
UM425. (The power connector only fits one way.)
NOTE: To extend the life of the radio, use waterproof tape to seal
electrical connections.
4. Install your antenna according to the manufacturer's instructions.
5. If necessary, consult the FCC guidelines for antenna separation. See
Antenna Selection and Installation on page 69 for more details. (In
summary, the FCC recommends that antennas up to 3 dB be installed
a minimum of 3 feet from any occupied location; antennas over 3 dB
should be installed at least 6 feet away.)
6. Connect the PL-259 connector from the antenna lead-in wire to the
SO238 connector labeled ANTENNA on the back of the UM425.
Radio connector,
SO238 (female
PL-259)
Antenna lead-in
connector,
male PL-259
E-45