Abstract: The present invention relates to a device (1) for supporting, housing and cooling radiant modules (2) of an antenna, comprising a plate (3) for cooling said radiant modules (2) that can be fixed to means for supporting said antenna, said plate (3) having an upper surface and a lower surface; characterized in that it comprises a plurality of projecting guides (5) provided at least on one of said surfaces of said plate (3), so that each pair of said projecting guides (5) adjacent with surface on which are provided realize housing seats (6), in each one of which one of said radiant modules (2) is introduced; and pressing means (7, 15, 16, 17), integrated with said projecting guides (5), apt exerting a pressure on said radiant modules (2) so as to obtain a substantially uniform coupling between each of them and the surface of said plate (3) on which said projecting guides (5) are provided. The invention further relates to an array antenna.