In recent years, wireless communications have progressed very rapidly which increases the need to provide antennas with a large bandwidth for multiple wireless applications. Therefore, the wideband antenna design has become very important. Spiral antenna is the type of broadband antennas which can be used for transmitting and receiving signals in wideband applications. In this work, a compact square spiral slot antenna design is proposed for wideband applications. The proposed antenna consists of two square spiral slots with a coplanar waveguide (CPW) feeding structure. The proposed antenna with and without corner truncation are simulated and measured. The design of the antenna and its feeder are fabricated on a single-layer printed circuit board (PCB) with extremely low manufacturing cost. The antenna is compact in size with overall dimensions 45×70×1.6 mm3. The antenna is fabricated on FR4 substrate and the results of the return loss are measured. The characteristics of the corner truncated square-spiral slot are calculated and compared with the square-spiral slot by using the electromagnetic simulator IE3D software. The simulation results show that the antenna’s operating bandwidth is between (2.0 - 7.0 GHz). The obtained results for -10dB return loss and gain show that the proposed slot antenna with CPW-fed is suitable for WLAN (wireless local area network) and WiMAX (Worldwide Interoperability for Microwave Access) applications.