What is the typical range of an AIS station?

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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