The rapid development in medical application has led to increased demand for information and remote medical services using WLAN or WiMAX networks. This study proposes a multiband monopole antenna for WLAN and WiMAX applications, including two new WLAN frequency allocations in 5.4705.725 GHz and 5.9006.700 GHz. The proposed design is simple with a compact size and has wideband bandwidth for all resonant frequency. The design antenna is formed with monopole antenna and metamaterial that places in the upper side of the patch antenna through a small gap. Modification of the RSRR metamaterial shape can minimize the antenna size by 47%, without reducing other antenna performance (bandwidth and gain). The measured results show multiband antennas with 2 wide band frequency at f1 2.2444.312 GHz (63.09%), and f2 4.9106.843 GHz (32.89%). With the wide bandwidth in both resonant frequency, this antenna can be used for WLAN, WiMAX, ISM, and satellite communication.