The ITU Radiocommunication Assembly considering a) that mobile earth-station antenna performance substantially affects system design in mobile-satellite services; b) that multipath fading due to reflection and shadowing due to foliage and natural or man-made structures are important factors in designing and constructing mobile-satellite systems; c) that there are various techniques which may be adopted for keeping mobile earth station antennas pointed correctly; d) that the configuration of airborne antenna systems is severely constrained by the effect on aircraft performance; e) that services using medium and low gain antennas are being used by systems of the International Mobile Satellite Organization (IMSO) and other organizations; f) that characteristics of multipath fading are being studied in ITU-R Study Group 3 under Question ITU-R 207/3; g) that some mobile ship, aircraft and land earth stations will be operating at high latitudes of the globe and may consequently have special propagation and antenna design problems.