Secondary radar equipped with a main antenna (1, 12) comprising two elements: - an SSR antenna presenting three radiation patterns, a sum diagram, a difference diagram and a control diagram assigned to a control function, corresponding to said SSR antenna; - a rear radiating element, assigned to a control function, associated with the control channel of the SSR antenna; characterised in that it further comprises means capable of detecting a high elevation target located in the silence cone of said SSR antenna, said means comprising: - an auxiliary antenna device (41, 42), fixed above said antenna (1, 12), making it possible to ensure the tracking in the silence cone of all the targets; said auxiliary antenna device comprising: - an antenna oriented towards the front of said main antenna, exhibiting three radiation patterns, a sum diagram, a difference diagram and a control diagram; - a radiating element located at the rear, assigned to a control function, having a control diagram; - coupling means; said antenna being of the same orientation as the SSR antenna and being inclined in elevation with respect to the SSR antenna so as to present a maximum gain in the direction of the silence cone and a minimum gain both just above 90° of elevation and below 40 ° of elevation; said rear radiating element also being inclined in elevation, so as to present a maximum gain beyond 90 ° of elevation and to obtain reciprocal inclinations of the antenna and of the rear radiating element such that their gains are substantially the same for an elevation close to 90 °; said coupling means carrying out, independently for each pattern, the coupling of each of the three radiation patterns of said main antenna (1, 12) with the pattern of corresponding radiation from said auxiliary antenna device (41, 42), the coupling being carried out with a given coupling coefficient; in order to obtain three resulting antenna diagrams: a resulting sum diagram, a resulting difference diagram and a resulting control diagram, making it possible to guarantee, in the silence cone, a maximum gain of the sum diagram resulting from a value of the order of 20 dB less than that of the gain plateau of the sum channel of the SSR antenna. - an SSR antenna presenting three radiation patterns, a sum diagram, a difference diagram and a control diagram assigned to a control function, corresponding to said SSR antenna; - a rear radiating element, assigned to a control function, associated with the control channel of the SSR antenna; - an auxiliary antenna device (41, 42), fixed above said antenna (1, 12), making it possible to ensure the tracking in the silence cone of all the targets; said auxiliary antenna device comprising: - an antenna oriented towards the front of said main antenna, exhibiting three radiation patterns, a sum diagram, a difference diagram and a control diagram; - a radiating element located at the rear, assigned to a control function, having a control diagram; - an antenna oriented towards the front of said main antenna, exhibiting three radiation patterns, a sum diagram, a difference diagram and a control diagram; - a radiating element located at the rear, assigned to a control function, having a control diagram; - coupling means;