The ITU Radiocommunication Assembly considering a) that a ghost cancelling system using a ghost cancelling reference (GCR) signal is one of the most effective countermeasures for ghost images in individual and collective antenna reception of television signals; b) that the system should be effective for cancelling multiple and long delayed ghost images as well as short delayed ghost images and it should be also effective for leading ghosts and waveform equalization of video signals; c) that the GCR signals can be inserted into the lines in the vertical blanking intervals; d) that for each television system an appropriate GCR signal can be defined; e) that for each country the appropriate GCR signal can be used to suit the various propagation conditions and the types of transmission media; f) that the ghost canceller using the GCR signals can be manufactured at a reasonable cost; g) that the cost of ghost cancellers may be lower if there is widespread use of a common GCR signal.