A wireless device comprising a radiating system that comprises: an antenna system comprising at least one antenna component (2205, 3201) arranged on a single piece of a dielectric material substrate, the at least one antenna component including a first multi-section antenna component (2205, 3201) comprising at least two sections (702, 901, 1001, 1101, 1201, 2901, 3503-3505), each of the at least two sections comprising a conductive element (2203, 2204), the conductive elements (2203, 2204) being arranged in one or more layers parallel along a first direction; at least one ground plane layer spaced apart from the antenna system at least along the first direction, the first direction being parallel to the at least one ground plane layer; and a matching network (3203, 3507-3509, 3602, 3603) connected to the antenna system for impedance matching to a first frequency range at a port (1503, 1703, 2801, 2802, 2903, 2904) also connected to said matching network (3203, 3507-3509, 3602, 3603); and wherein the radiating system is configured to operate in a frequency range of operation including said first frequency range, the first frequency range comprising a first highest frequency and a first lowest frequency; the conductive element (2203, 2204) contained in at least one of the at least two sections of the first antenna component (2205, 3201) is a booster element having a maximum size smaller than 1/20 times the free-space wavelength corresponding to the lowest frequency of operation, the maximum size being defined by a largest dimension of a booster box that is a minimum-sized parallelepiped of square or rectangular faces that completely encloses the respective booster element, and wherein each one of the faces of the minimum-sized parallelepiped is tangent to at least a point of the respective booster element, each booster element being a non-resonant element in the first frequency range that excites at least a radiation mode in the at least one ground plane layer; the conductive element (2203, 2204) contained in at least another one of the at least two sections of the first antenna component (2205, 3201) is a radiating element having a maximum size bigger than 1/20 times the free-space wavelength corresponding to the lowest frequency of operation; characterized in that: the conductive element (2203, 2204) of the radiating element is spaced apart from the conductive element (2203, 2204) of the booster element by a gap, the gap featuring a value between 0.25 mm and 4 mm. an antenna system comprising at least one antenna component (2205, 3201) arranged on a single piece of a dielectric material substrate, the at least one antenna component including a first multi-section antenna component (2205, 3201) comprising at least two sections (702, 901, 1001, 1101, 1201, 2901, 3503-3505), each of the at least two sections comprising a conductive element (2203, 2204), the conductive elements (2203, 2204) being arranged in one or more layers parallel along a first direction; at least one ground plane layer spaced apart from the antenna system at least along the first direction, the first direction being parallel to the at least one ground plane layer; and a matching network (3203, 3507-3509, 3602, 3603) connected to the antenna system for impedance matching to a first frequency range at a port (1503, 1703, 2801, 2802, 2903, 2904) also connected to said matching network (3203, 3507-3509, 3602, 3603); and wherein the radiating system is configured to operate in a frequency range of operation including said first frequency range, the first frequency range comprising a first highest frequency and a first lowest frequency; the conductive element (2203, 2204) contained in at least one of the at least two sections of the first antenna component (2205, 3201) is a booster element having a maximum size smaller than 1/20 times the free-space wavelength corresponding to the lowest frequency of operation, the maximum size being defined by a largest dimension of a booster box that is a minimum-sized parallelepiped of square or rectangular faces that completely encloses the respective booster element, and wherein each one of the faces of the minimum-sized parallelepiped is tangent to at least a point of the respective booster element, each booster element being a non-resonant element in the first frequency range that excites at least a radiation mode in the at least one ground plane layer; the conductive element (2203, 2204) contained in at least another one of the at least two sections of the first antenna component (2205, 3201) is a radiating element having a maximum size bigger than 1/20 times the free-space wavelength corresponding to the lowest frequency of operation; characterized in that: the conductive element (2203, 2204) of the radiating element is spaced apart from the conductive element (2203, 2204) of the booster element by a gap, the gap featuring a value between 0.25 mm and 4 mm.