Furuno GP-1610CF Operator's Manual page 15

Figure 1-3 Typical antenna unit mounting locations
Antenna unit mounting procedure
You will need a medium size slotted-head screwdriver and vinyl
tape.
The standard antenna is usually fastened to a length of pipe and
fastened to a mast. (A mast mount fixture is optionally available
for this.) The threaded antenna base accepts a standard antenna
mount with a 1"-14 straight thread. Mount the antenna on a length
of pipe with a 1"-14 threaded end.
1. Pass the antenna cable through the pipe. Fasten the connector
on the cable to the antenna.
Antenna
Pipe
Antenna cable
Figure 1-4 Passing antenna cable through pipe
1-5