A novel internal monopole antenna for wireless USB dongle application is proposed. The proposed antenna covers the WiBro, WLAN, Bluetooth, S-DMB, and WiMAX bands with a small size (15 mm × 5 mm × 1 mm). The overall dimension of the proposed antenna including the system ground is 45 mm × 15 mm × 1 mm. The proposed antenna consists of two strips and one stub. Two strips are connected by via mode (=0.4 mm). By adding a stub and stick-shaped strip, the wide dual resonant frequency characteristic can be achieved. Detailed design procedures and measured results of the prototype are discussed.