To provide a Yagi-Uda antenna assembly which has high reception sensitivity in a first specified band and can obtain reception sensitivity above a specified value in a second specified band even when compact.

The Yagi-Uda antenna assembly equipped with a radiator, a reflector, and waveguides is equipped with a plurality of different-length waveguides each having a plurality of stack type waveguide elements constituted by stacking equal-length waveguide elements, and the waveguides are made longer toward the radiator.