There is disclosed a multiband antenna device comprising a conductive elongate antenna element configured for electrical connection to a groundplane at a grounding point, and a conductive elongate feeding element configured for electrical connection to a radio transmitter/receiver at a feeding point. At least a major portion of the antenna element is configured to extend in a first direction and to double back on itself in a second, substantially counter-parallel direction forming a slot. The feeding point is adjacent to the grounding point, and the feeding element is configured to extend substantially parallel to the first and second directions of the major portion of the antenna element. The antenna device can operate in multiple frequency bands, and can be configured on a dielectric insulating former that fits compactly in a corner of a mobile communications handset housing.