Abstract: The present invention is related to a device for retaining and fixing an advertising medium outdoors taking the form, for instance, of a canvas, said device comprising a frame (1) delimited by four struts, two lateral struts (2,3), an upper strut and a lower strut (5), each of said struts (2,3,5) being composed of two parallel tubes (6,7) made of appropriate material and joined to each other by means of spacers (8,8?), said retaining device being characterised in that it comprises stabilizing means (100,100?) placed at the bottom of the frame (1) and designed in such a way that the device is able to resist forces exerted by the bad weather and in particular by the wind.