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, <EOS>