A folded monopole antenna fed by a CPW-to-trident transition feeder for compact wireless USB dongle devices is proposed. The antenna's dimensions are 16×44.8×3.5mm³, so it is suitable for low-profile wireless USB dongles. The proposed, compact monopole antenna resonates from 2.28GHz to 10.8GHz; hence, it can cover all wireless bands including WiBro (2.3-2.4GHz), Bluetooth (2.4-2.484GHz), WiMAX (2.5-2.7GHz and 3.4-3.6GHz), satellite DMB (2.605-2.655GHz), 802.11b/g/a WLAN (2.4-2.485GHz and 5.15-5.825GHz), and UWB (3.1-10.6GHz). A fabricated antenna is tested on a laptop to investigate the effects of the keypad and LCD screen on the resonant frequency and radiation pattern. The measured average gain of the fabricated antenna ranges from -2.76dBi to 0.72dBi.