iStumbler 103.43 for Mac

iStumbler is probably the best application you can use if you want to scan for wireless networks surrounding you.

Not only is it capable of showing detailed information about WiFi network, but it also detects Bluetooth devices or Bonjour services.

iStumbler allows you to choose the frequency of wireless networks from the control panel of the application.You can also choose the status of the Bluetooth devices it will detect: connected, enabled,...

The information given by iStumbler is very detailed, including signal strength, noise level, network name, MAC address, channel and more.