AirPort Radar

Port Radar is a Dashboard widget that lists all the wireless networks that can be detected from your location. The color orange identifies the network to which you're connected, the color blue indicates nearby networks, and gray is for networks with which you've lost contact. The length of the color bar represents the strength of the signal. The resulting wireless networks can be organized by name, signal strength, or the channel that they're using. You can modify the frequency with which the widget updates in the program options. The following hardware are compatible with AirPort Radar: AirPort cards, MacWireless PC 11g and PCI 11g.