A complex antenna (100) comprises a grounding patch (3) extending in a longitudinal direction and having opposite first and second sides; a first antenna (1) comprising a first radiating element (11), a second radiating element (12), a third radiating element (13), and a first connecting element (14); a second antenna (2) comprising a fourth radiating element (21), a fifth radiating element (22), and a second connecting element (23). A gap is formed in the middle portion of the second side of the grounding patch. The first connecting element extends from an end of the gap and comprises a first connecting arm coplanar with the grounding patch and a second connecting arm vertical to the grounding patch. The first connecting arm and the grounding patch is formed a slot. The second connecting element extends from an end of the grounding patch.