WirelessNetView is a small utility that monitors the activity of wireless networks around you.
Description
WirelessNetView is a small utility that runs in the background, and monitor the activity of wireless networks around you. For each detected network, it displays the following information: SSID, Last Signal Quality, Average Signal Quality, Detection Counter, Authentication Algorithm, Cipher Algorithm, MAC Address, RSSI, Channel Frequency, Channel Number, and more.
System Requirements
* Wireless network adapter and wireless card driver that works with the built-in wireless support of Windows XP/Vista.
* Windows Vista or Windows XP with SP2/SP3. For Windows XP with SP2, it's recommended to install the KB918997 update.
http://www.nirsoft.net/utils/wireless_network_view.html