The propagation phenomenon that results in radio signals' reaching the receiving antenna by two or more paths. Note 1: Causes of multipath include atmospheric ducting, ionospheric reflection and refraction, and reflection from terrestrial objects, such as mountains and buildings. Note 2: The effects of multipath include constructive and destructive interference, and phase shifting of the signal. Note 3: In facsimile and television transmission, multipath causes jitter and ghosting.