The invention relates to an antenna assembly (3) for an aircraft (1). The aircraft antenna assembly has a support element (6) having a first and a second surface (7,8) on opposite sides of the supportelement, at least one antenna element arranged on or in the support element (6), and a sealing device (15). The first surface (7) and the sealing device (15) are configured such that the antenna assembly (3) is arranged on an outer skin section (9) of an aircraft (1) such that the first surface (7) faces the outer skin section (9), the sealing device (15) is situated between the support element (6) and the outer skin section (9), and at least one cavity (16) is defined by the sealing device (15), the outer skin section (9) and the first surface (7).