The range of an AIS station depends on its position. An antenna which is placed 15 metres above sea level will receive AIS information within a range of 15-20 nautical miles. With an antenna placed about several 100 metres above sea level an even wider range can be achieved. The higher the better - this has to do with the curvature of the earth, which does affect the reception of AIS signals, if an antenna is placed to low.
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