The utility model discloses a ride straddle type and cross wireless bridge of radiation protection window, including set up on the windowsill and opening U -shaped is down ridden and is striden the seat, ride the flat antenna guiding mechanism who strides an outer end and be connected with the U -shaped, the directional aerial that is connected with flat antenna guiding mechanism outer end, the bridging module of being connected with directional aerial to and machine controller, flat antenna guiding mechanism including z axle telescopic link, set up in the y axis stepper motor of z axle telescopic link joint department and set up the x axis stepper motor who contracts the rod end head and be connected in the z shaft extension with directional aerial, y axis stepper motor, x axis stepper motor all are connected with machine controller. The utility model discloses the mountable is on the windowsill of high building window, and its directional aerial protractile is to having only the 5CM gap outside window, and direction and angle through control directional aerial obtain best signal intensity.