A portable sign system suitable for advertising signs removably inserted into the earth, such as real estate signs, has a display frame for holding a sign placard, frame sides, and separate ground stakes. Each of the ground stakes can be releaseably connected to one of the frame sides or bottom frame in one of two positions. In the first position, the ground stake is extended from the respective frame side so that the ground stake can be inserted into the ground; in the second position, the orientation of the ground stake is reversed when connected to the frame side or is laid parallel to the bottom frame, so that the overall length of the portable sign system is reduced from that of the first position. The reduction in length allows the portable sign to be easily loaded into the trunk of a vehicle, for example.

A signal device is disclosed. The signal device may include a signal shaft and a support shaft. The signal shaft and the support shaft may be adjoined using a coupler. The signal shaft may be coupled to a signal paddle and a handle and rotatably disposed within the coupler. The signal paddle may be rotated by rotating the signal shaft to display a sign, and the signal shaft may be rotated by rotating the handle.

A wind-driven poster display system enables quick insertion of a poster display and rotates the poster display to catch the attention of people in the area or passing by. A wind-driven poster display employs a rotor assembly coupled to a stator assembly having a foundation base. The rotor assembly, including the poster mounting frame, rotates about the stator assembly via a bearing that is coupled between the stator assembly and rotor assembly by a stator-rotor coupling assembly. The poster mounting frame rotates via wind, wherein the poster mounting frame has a wind-capture mechanisms, wing blades extending from each of the respective left extension and right extension of the poster mounting frame, in opposing directions. When the wind blows, the wing blades catch the wind and cause the poster mounting frame to spin to expose a first surface and subsequently a second surface of the poster mounting frame.