A structure for radar detection comprising: - a support body adapted to be fixed to a wall, - an orienting body, which is connected to the support body so as to be orientable in a plurality of directions, the orienting body having a compartment, and - a radar device for intrusion detection, comprising: - a housing fixed in the compartment of the orienting body, the housing comprising a front wall, a peripheral wall, which extends in a longitudinal direction (X-X) between the front wall and a rear end portion, and which delimits a housing seat for an electronic unit, and a fixing support located in the housing seat, - an electronic unit, which is accommodated in the housing seat, fixed to the fixing support and spaced apart from the front wall in the longitudinal direction (X-X) at a first distance, the electronic unit being configured to transmit an electromagnetic signal out of the housing, mainly in the longitudinal direction (X-X) through the front wall, - a shield for blocking the electromagnetic signal, wherein the shield surrounds the electronic unit and defines a channel that extends in the longitudinal direction (X-X) between a front end portion proximate to the front wall and a rear end portion spaced apart from the front wall at a second distance that is greater than or substantially equal to the first distance, wherein the shield is fixedly mounted to the housing, and wherein the front end portion of the shield defines a front opening of the channel and the rear end portion of the shield defines a rear opening of the channel. - a support body adapted to be fixed to a wall, - an orienting body, which is connected to the support body so as to be orientable in a plurality of directions, the orienting body having a compartment, and - a radar device for intrusion detection, comprising: - a housing fixed in the compartment of the orienting body, the housing comprising a front wall, a peripheral wall, which extends in a longitudinal direction (X-X) between the front wall and a rear end portion, and which delimits a housing seat for an electronic unit, and a fixing support located in the housing seat, - an electronic unit, which is accommodated in the housing seat, fixed to the fixing support and spaced apart from the front wall in the longitudinal direction (X-X) at a first distance, the electronic unit being configured to transmit an electromagnetic signal out of the housing, mainly in the longitudinal direction (X-X) through the front wall, - a shield for blocking the electromagnetic signal, - a housing fixed in the compartment of the orienting body, the housing comprising a front wall, a peripheral wall, which extends in a longitudinal direction (X-X) between the front wall and a rear end portion, and which delimits a housing seat for an electronic unit, and a fixing support located in the housing seat, - an electronic unit, which is accommodated in the housing seat, fixed to the fixing support and spaced apart from the front wall in the longitudinal direction (X-X) at a first distance, the electronic unit being configured to transmit an electromagnetic signal out of the housing, mainly in the longitudinal direction (X-X) through the front wall, - a shield for blocking the electromagnetic signal,