This Recommendation provides a reference radiation pattern for ship earth station antennas that should be used for coordination studies and the assessment of interference between ship earth stations in the mobilesatellite service (MSS) and terrestrial and space stations which share the same frequency bands. The technical considerations on the proposed reference radiation pattern are also contained in the Recommendation that include the existing reference radiation patterns used for various services, measured antenna patterns, and the effect of the reflection from the sea and a ship’s superstructure.