A ground plane, at least one composite antenna, and a power feeding line configured to supply power to the at least one composite antenna are provided in or on a substrate. The composite antenna includes a power feeding element configuring a patch antenna together with the ground plane, and at least one linear antenna configured to flow an electric current having a component in a vertical direction with respect to the ground plane. The power feeding line includes a main line connected to the power feeding element, and a branch line branched from the main line and connected to the linear antenna.