Abstract: In an air-cooled steam condenser (2, 2'), each tube of a bundle (8, 8') of finned heat exchange tubes, arranged parallel to each other and horizontally, and connecting a steam dispensing manifold (4, 4') to an outlet manifold (5, 5'), is in the form of a coil including three finned elements (12, 13, 14) which are arranged horizontally and parallel to each other in consecutive rows relative to the direction of the cooling air flow (11, 11'), and which are connected together by two elbow fittings (15, 16) positioned at an angle with a positive slope so as to facilitate the drainage of the condensate.