A convenient and versatile realtor sign system is separable into components which are easily carried in an automobile trunk or back seat compartment. The sign is easily set up at a property site with a desired number of stacked auxiliary sign sections containing various indicia. A convenient low effort driving tool for the ground penetrating main standard of the sign is included. The main sign panel is attachable to the realtor' s automobile door through the same apertures which connect the main sign panel to the separable ground-mounted support structure.