Here some basic type of Wi-fi antenna which currently used in routine like WLAN antenna 2.4 GHz Do-It-Yourself,802.11b Homebrew WiFi Antenna Shootout,Vertical antenna,13 cm Helix Antenna, 2.4GHz 10 Element Brass Yagi,2.4 Ghz High gain antenna,43.33 Km LOS with USB WiFi stick,2.4Ghz Helix antenna, Simple double-quad Antenna