High-frequency-tight housing, in particular high-frequency-tight antenna outlets or multimedia outlets comprising the following features: - a shielding housing is provided that comprises a housing opening to be shielded, - the shielding housing includes a base and peripheral side walls (3; 3', 3"), - a shielding cover for shielding the housing opening (1 a) is provided and seals the housing opening, - a shielding hood is also provided and comprises, in addition to a central hood portion, wall, edge or flange portions protruding transversely thereto, - the shielding hood is placed on the housing opening by its wall, edge or flange portions such that the wall, edge or flange portions of the shielding hood overlap the side walls of the shielding housing on the outer face thereof, - by means of its hood inner wall surfaces, the shielding hood overlapping the housing opening (1 a) is electrically contacted to outer contact surfaces (3'a) on the outer face of the side walls (3, 3', 3"), which surfaces are formed on the inner face of the wall, edge or flange portions, characterised by the following further features: - the shielding cover is inserted into the housing opening for shielding said housing opening, - the shielding cover is electrically contacted with the shielding housing on the inner face thereof, - the shielding cover comprises a cover edge (11 a), between which edge and the inner face of the side walls there is galvanic contact, at least in the form of galvanic contact points that are provided in a manner offset from one another in the peripheral direction of the shielding cover and by means of which the galvanic contact between the shielding cover and the inner face of the side walls is generated, and - the shielding hood is dimensioned such that a) the side walls thereof exert a force on the side walls of the shielding housing when assembled in order to increase the contact force between the shielding cover and the housing inner walls (3"a), and/or b) the shielding hood at least partially counteracts bulging, caused by the shielding cover, of the side walls of the shielding housing towards the outside or deforms these side walls back. - a shielding housing is provided that comprises a housing opening to be shielded, - the shielding housing includes a base and peripheral side walls (3; 3', 3"), - a shielding cover for shielding the housing opening (1 a) is provided and seals the housing opening, - a shielding hood is also provided and comprises, in addition to a central hood portion, wall, edge or flange portions protruding transversely thereto, - the shielding hood is placed on the housing opening by its wall, edge or flange portions such that the wall, edge or flange portions of the shielding hood overlap the side walls of the shielding housing on the outer face thereof, - by means of its hood inner wall surfaces, the shielding hood overlapping the housing opening (1 a) is electrically contacted to outer contact surfaces (3'a) on the outer face of the side walls (3, 3', 3"), which surfaces are formed on the inner face of the wall, edge or flange portions, - the shielding cover is inserted into the housing opening for shielding said housing opening, - the shielding cover is electrically contacted with the shielding housing on the inner face thereof, - the shielding cover comprises a cover edge (11 a), between which edge and the inner face of the side walls there is galvanic contact, at least in the form of galvanic contact points that are provided in a manner offset from one another in the peripheral direction of the shielding cover and by means of which the galvanic contact between the shielding cover and the inner face of the side walls is generated, and - the shielding hood is dimensioned such that a) the side walls thereof exert a force on the side walls of the shielding housing when assembled in order to increase the contact force between the shielding cover and the housing inner walls (3"a), and/or b) the shielding hood at least partially counteracts bulging, caused by the shielding cover, of the side walls of the shielding housing towards the outside or deforms these side walls back. a) the side walls thereof exert a force on the side walls of the shielding housing when assembled in order to increase the contact force between the shielding cover and the housing inner walls (3"a), and/or b) the shielding hood at least partially counteracts bulging, caused by the shielding cover, of the side walls of the shielding housing towards the outside or deforms these side walls back.