Abstract: A passive platform stabilization system is disclosed which is suitable for antenna stabilization in maritime communication systems. The stabilization system of the present invention comprises a platform rotatable in a horizontal plane. At least two gyros are suspended from the platform by suspension means which are rotatable about a vertical axis independent of the rotation of the platform in order to avoid undesirable torque components which would result from precession of the gyros. The platform pivots about axes which are parallel to the pitch and roll axes of a vessel on which it is mounted.