Atmospheric absorption accounts for a significant portion of the signal path loss on the Earth-Space link. The total atmospheric absorption due to Oxygen and water vapour on the path at Ku (12/14 GHz), Ka (20/30 GHz), and V (40/50 GHz) bands was evaluated for communication with Nigeria communication satellite (Nigcomsat1) on both uplink and down link at 0.01 % unavailability of an average year….