The impact of contextual events for the performance of high bandwidth communication UAV link is the theme of this paper. Applications in this field have some strict quality requirements, and the communication link performance is essential for the mission success. Several events in the flight or in the surroundings can interfere with the data stream. We describe a context-controlled system which could dynamically adapt the flight in order to cope with eventualities during a mission. The main constraints of the link are discussed, and we analyze the link budget for the link considering directional receiving and transmitting antennas.