Antenna array assembly

An antenna array assembly, comprising:

• at least a first and second antenna element, each antenna element comprising at least one radiator element disposed in a substantially parallel relationship to a respective ground plate, and each radiator element being disposed in the same orientation;
• and
• an isolator bar disposed between the respective ground plates of the first and second antenna elements, the isolator bar being elongate having a cross-section comprising a T shape, the cross-section being across a long axis, the isolator bar comprising:
• a support bar in contact with the ground plates of the first and second antenna elements, the support bar forming the stem of the T shape;
• and
• a substantially planar cross piece forming the top of the T shape and being disposed in a parallel relationship with the planes of the ground plates of the first and second antenna elements on the same side of the ground plates as the radiator elements,
• wherein the cross piece of the isolator bar has a width in the cross-section of at least a quarter of a wavelength at an operating frequency of the antenna array, whereby to provide radio frequency isolation between the first and second antenna elements.