JRC NJT8304 Series Instruction Manual page 18

6.2.2. Fixing Ground Wire
The Unit should be common with ground of other equipment (e.g.
antenna).
Fixing a ground wire from the common ground of other equipment for
grounding is proceed with the following step:
Step 1:
NJT8306 series Instruction Manual
Fix the ground wire from other equipment to the ground hole
near the coaxial connector with enclosed on the Unit.
Fixing the Ground Wire
To reduce the risk of damage or broken by lightning surge, the
Unit should be fixed with the ground wire.
IM-T8304 Rev.01
Page 18