14
WM-4 Marine Weather & Audio Receiver Installation Manual
Antenna Installation
Caution: When installing the antenna, do not cut or alter the antenna cable, or remove the cable connectors.
Two considerations are necessary before installing the antenna. First, finding a suitable mounting location,
and second determine how the antenna will be mounted. There are several in-box mounting options for the
antenna, or accessories can be purchased from marine stores for additional mounting options.
In choosing where to mount the antenna, consider whether you will be securing the antenna from the
underside of the mounting surface, or attaching the antenna to the mounting surface. Also, determine if the
antenna wire will be passed through the mounting surface, or if it will be routed along the surface.
If the distance between the antenna and the WM-4
Receiver is more than 25 feet, special cable kits are
available. Plan and purchase the appropriate kit before
proceeding (page 16).
Choose a Location
The antenna must be mounted horizontally, and in a
location that is open and has a clear view of the sky.
The antenna must also be mounted away from any metal
objects or other structures that could block the line-of-
sight reception of the satellite signal. The height of the
antenna is not as important as having a clear view of the
sky.
The antenna should be mounted a minimum of 1 m
(3 ft.) away from other radio transmitting antennas
(such as VHF or Sideband antennas), and a minimum of
2 m (7 ft.) from a radar antenna.
Once you have selected a possible mounting location,
sight a full 360
º
circle around the antenna at an
elevation angle of 25º to make sure no obstacles block
the antenna’s view of the sky.
*
1
2
2
2
Radar Beam
Clear 360
º
view of the sky in this area
25
º
from
horizon
25
º
from
horizon
*Keep antenna at least 1 m (3 ft.) away from engine to avoid interference.
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