Where can I purchase a cheap wireless antenna?

I've listed antenna for cell or computer. Wasn't sure what wireless connection you needed.All the sites have both for you to shop for what your looking for in wireless antennas.; )
Extend the range of your wireless network, or connect to other wireless networks in your neighborhood. Just connect the antenna to your wireless router, access point or network card, then point and shoot. (See below for list of compatible wireless devices.)
 
Package includes:
12 dBi Super Cantenna Booster Antenna Integrated 24-inch RF cable with RPSMA connector RPTNC adapter Dual tripod/pistol grip
 
Features:
Works with most wireless devices Directional 2.4 Ghz Wireless Network Booster Antenna Compatible with 802.11b and 802.11g wireless networks Use it with your wireless router, access point, or client card Universal mounting socket: fits standard camera tripods or other mounting hardware such as outdoor speaker mounts. Weather-resistant coating - new black color
 
most wireless devices Directional 2.4 Ghz Wireless Network Booster Antenna Compatible with 802.11b and 802.11g wireless networks Use it with your wireless router, access point, or client card Universal mounting socket: fits standard camera tripods or other mounting hardware such as outdoor speaker mounts. Weather-resistant coating - new black color