An electronic device comprising: a planar, rectangular ground plane with a first corner, a second corner diagonal from the first corner, a third corner adjacent to the first corner, and a fourth corner diagonal from the third corner, the planar, rectangular ground plane having a major length along a y-axis and a minor length along an x-axis; a first antenna having a first antenna element positioned at the first corner and a second antenna element positioned at the second corner; a second antenna having a third antenna element positioned at the third corner and a fourth antenna element positioned at the fourth corner, wherein the first antenna and second antenna are diagonally oriented relative to each other and configured to provide significant excitation along the y-axis of the planar, rectangular ground plane and non-negligible excitation along the x-axis of the planar, rectangular ground plane or significant excitation along the x-axis of the planar, rectangular ground plane and non-negligible excitation along the y-axis of the planar, rectangular ground plane; a first phase shifter configured to drive the first antenna element out of phase relative to the second antenna element at low band frequencies; and a second phase shifter configured to drive the third antenna element out of phase relative to the fourth antenna element at low band frequencies, characterised in that during high band transmission, the first and the second phase shifters are configured to drive the diagonally positioned elements (111, 115, 121, 125) of each antenna (110, 120) of the antenna system either in-phase or out-of-phase. a planar, rectangular ground plane with a first corner, a second corner diagonal from the first corner, a third corner adjacent to the first corner, and a fourth corner diagonal from the third corner, the planar, rectangular ground plane having a major length along a y-axis and a minor length along an x-axis; a first antenna having a first antenna element positioned at the first corner and a second antenna element positioned at the second corner; a second antenna having a third antenna element positioned at the third corner and a fourth antenna element positioned at the fourth corner, wherein the first antenna and second antenna are diagonally oriented relative to each other and configured to provide significant excitation along the y-axis of the planar, rectangular ground plane and non-negligible excitation along the x-axis of the planar, rectangular ground plane or significant excitation along the x-axis of the planar, rectangular ground plane and non-negligible excitation along the y-axis of the planar, rectangular ground plane; a first phase shifter configured to drive the first antenna element out of phase relative to the second antenna element at low band frequencies; and a second phase shifter configured to drive the third antenna element out of phase relative to the fourth antenna element at low band frequencies, characterised in that during high band transmission, the first and the second phase shifters are configured to drive the diagonally positioned elements (111, 115, 121, 125) of each antenna (110, 120) of the antenna system either in-phase or out-of-phase.