A complex antenna includes a first antenna and a second antenna having a grounding element and an installing element sharing with the first antenna. The first antenna working in a WLAN (Wireless Local Area Network) comprises a first connecting element, a first radiating element and a second radiating element extending from the first connecting element in opposite direction. The second antenna working in a WWAN (Wireless Wide Area Network) comprises a second connecting element and at least three radiating elements extending from the second connecting element in different directions.