An antenna element for a multi-band antenna device, the antenna element comprising: a dielectric body provided with one or more metal layers, the dielectric body comprising a base plate and one or more wall elements arranged on the base plate and formed integrally with the base plate and/or protruding from the base plate; one or more first radiating elements arranged on the base plate, each first radiating element being configured to radiate in a first frequency band; one or more second radiating elements arranged on the base plate, each second radiating element being configured to radiate in a second frequency band; a first feeding network connected to the one or more first radiating elements, for operating the one or more first radiating elements as a first antenna array; and a second feeding network connected to the one or more second radiating elements, for operating the one or more second radiating elements as a second antenna array; wherein the first feeding network is provided, at least partly, as a metal layer of the one or more metal layers on the one or more wall elements (101b, 101c); wherein: the one or more wall elements (101b, 101c) comprise an outer wall element, which extends along the edges of the base plate, and one or more inner wall elements, each inner wall element connecting the outer wall element to one of the one or more first radiating elements, a part of the first feeding network is provided as a metal layer of the one or more metal layers on the outer wall element, and a part of the first feeding network is provided as a metal layer of the one or more metal layers on the inner wall elements. a dielectric body provided with one or more metal layers, the dielectric body comprising a base plate and one or more wall elements arranged on the base plate and formed integrally with the base plate and/or protruding from the base plate; one or more first radiating elements arranged on the base plate, each first radiating element being configured to radiate in a first frequency band; one or more second radiating elements arranged on the base plate, each second radiating element being configured to radiate in a second frequency band; a first feeding network connected to the one or more first radiating elements, for operating the one or more first radiating elements as a first antenna array; and a second feeding network connected to the one or more second radiating elements, for operating the one or more second radiating elements as a second antenna array; wherein the first feeding network is provided, at least partly, as a metal layer of the one or more metal layers on the one or more wall elements (101b, 101c); wherein: the one or more wall elements (101b, 101c) comprise an outer wall element, which extends along the edges of the base plate, and one or more inner wall elements, each inner wall element connecting the outer wall element to one of the one or more first radiating elements, a part of the first feeding network is provided as a metal layer of the one or more metal layers on the outer wall element, and a part of the first feeding network is provided as a metal layer of the one or more metal layers on the inner wall elements. the one or more wall elements (101b, 101c) comprise an outer wall element, which extends along the edges of the base plate, and one or more inner wall elements, each inner wall element connecting the outer wall element to one of the one or more first radiating elements, a part of the first feeding network is provided as a metal layer of the one or more metal layers on the outer wall element, and a part of the first feeding network is provided as a metal layer of the one or more metal layers on the inner wall elements.