An antenna of a radio device, which antenna comprises: - a first elongated antenna component (210; 710) with a first substrate and a first radiator (212; 712) - a second elongated antenna component (220; 720) with a second substrate and a second radiator (222; 722), and - a ground plane of a printed circuit board of the radio device between said elongated antenna components (210; 710; 220; 720), where: - the first elongated antenna component (210; 710) constitutes with the ground plane a first partial antenna, which has a first feed point, - the second elongated antenna component (220; 720) constitutes with the ground plane a second partial antenna which has a second feed point, - said elongated antenna components (210; 710; 220; 720) are located along opposite sides of the circuit board of the radio device to lower the correlation between the signals of the partial antennas, - said elongated antenna components (210; 710; 220; 720) have a same longitudinal direction as two parallel sides of said printed circuit board of the radio device, - said feed points (FP1; FP2) are located on a same side of the circuit board, the first feed point at an end of the first elongated antenna component (210; 710) and the second feed point at an end of the second elongated antenna component (220; 720), characterised in that - both partial antennas(220;720) have an operating band below the frequency of 1GHz locations of said feed points (FP1; FP2) on inner side surfaces of the first and second substrates, which inner side surfaces are on the sides of the middle part of the circuit board, are configured to cause an orientation of a dipole axis of said first elongated antenna component (210; 710) differ non-orthogonally from an orientation of a dipole axis of said second elongated antenna component (220; 720), to further lower the correlation between the signals of the partial antennas in said operating band. - a first elongated antenna component (210; 710) with a first substrate and a first radiator (212; 712) - a second elongated antenna component (220; 720) with a second substrate and a second radiator (222; 722), and - a ground plane of a printed circuit board of the radio device between said elongated antenna components (210; 710; 220; 720), where: - the first elongated antenna component (210; 710) constitutes with the ground plane a first partial antenna, which has a first feed point, - the second elongated antenna component (220; 720) constitutes with the ground plane a second partial antenna which has a second feed point, - said elongated antenna components (210; 710; 220; 720) are located along opposite sides of the circuit board of the radio device to lower the correlation between the signals of the partial antennas, - the first elongated antenna component (210; 710) constitutes with the ground plane a first partial antenna, which has a first feed point, - the second elongated antenna component (220; 720) constitutes with the ground plane a second partial antenna which has a second feed point, - said elongated antenna components (210; 710; 220; 720) are located along opposite sides of the circuit board of the radio device to lower the correlation between the signals of the partial antennas, - said elongated antenna components (210; 710; 220; 720) have a same longitudinal direction as two parallel sides of said printed circuit board of the radio device, - said feed points (FP1; FP2) are located on a same side of the circuit board, the first feed point at an end of the first elongated antenna component (210; 710) and the second feed point at an end of the second elongated antenna component (220; 720), characterised in that - both partial antennas(220;720) have an operating band below the frequency of 1GHz locations of said feed points (FP1; FP2) on inner side surfaces of the first and second substrates, which inner side surfaces are on the sides of the middle part of the circuit board, are configured to cause an orientation of a dipole axis of said first elongated antenna component (210; 710) differ non-orthogonally from an orientation of a dipole axis of said second elongated antenna component (220; 720), to further lower the correlation between the signals of the partial antennas in said operating band.