An antenna assembly and an unmanned aerial vehicle. The antenna assembly comprises an antenna unit at least operating at two frequency bands and a guide object, wherein the at least two frequency bands comprises the first frequency band and the second frequency band, and the guide object is used for changing a radiation direction of the antenna unit in a first plane and a radiation direction of the antenna unit in a second plane. The antenna assembly is used for optimizing and changing radiation direction patterns of the antenna unit, the implementation method is simple, the effect is good, and requirements of the unmanned aerial vehicle on antenna miniaturization and easy installation are satisfied.