Amazon.com: 3 WiFi 9dBi Dual Band Omni Directional Antenna 2.4Ghz/5Ghz with RP-SMA Male Connector for Wireless Wi-Fi Router and Network Devices : Electronics
Easy Homemade 2.4 Ghz Omni Antenna - Gumph
All About Omnidirectional Wi-Fi Antennas - Projects
Omni WiFi Antenna - 12dB - RadioLabs
All About Omnidirectional Wi-Fi Antennas - Projects
How to Make a Wifi Antenna (with Pictures) - wikiHow