The ITU Radiocommunication Assembly considering a) that reflected signals can be generated by re-radiating structures such as tall buildings or tall antenna structures; b) that receiving antenna directivity is sometimes ineffective in eliminating reflected signals; c) that reflected signals can be also generated on cable distribution systems and collective antenna systems; d) that reflected signals can impair the received television picture and can also adversely affect reception of additional broadcasting services; e) that it is possible to cancel reflected signals by means of automatic circuits in the receiver; f) that reflected signals may have a different effect on analogue and digital television signals, g) that reflected signals may have different effects depending on different digital modulation systems.