The ITU Radiocommunication Assembly considering a)that determination of criteria for frequency sharing between point-to-multipoint systems in the fixed service and systems in other services requires a knowledge of radiation patterns of omnidirectional and sectoral antennas along all possible interfering paths;b)that the use of reference radiation patterns for omnidirectional and sectoral antennas would facilitate interference calculations; c)that different reference radiation patterns may be required for the various types of antennas in use.