Raymarine RD418HD User Manual page 14

Dimensions - 24 inch antenna
Antenna Position
The optimum height for the HD Digital Radome Antenna (the
antenna) is a location that is high enough above the waterline to
give a long range line-of-sight to the horizon, but not so high as to
be adversely affected by the boat's pitching and rolling.
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The antenna must also be mounted where it is:
• Above head height.
• Easily accessible.
• As near as possible to the boat's centerline.
• On a rigid and stable platform, capable of securely supporting the
antenna under seagoing conditions.
• Clear of large objects such as the flybridge, large engine stacks,
searchlights, horns, masts etc.
• Clear of heat and fumes.
• At least 1 m (3.3 ft) from a magnetic compass or other antennae.
Antenna Mounting Angle
The radar beam from the HD Digital Radome Antenna is
approximately 25° wide in the vertical direction, to give good target
detection even when your boat pitches and rolls.
HD Digital Radome User's Guide