NorthStar 8700 Technical Reference Manual page 38

Section 7 - Antennas
PAGE 28
charges in the atmosphere. If the beacon receiver antenna is the highest
object, these discharges can totally override the beacon signals and cause
poor operation in bad weather.)
The optimal antenna location is high and clear for fair-weather operation,
but below the top of a metal mast or other antenna for best foul-weather
operation. On sailing vessels, the antenna might be mounted on top of a
low mast, or on the stern rail, if no other suitable location is available.
05/01/97 REV H