AirRadar 2.3

Scanning for wireless networks is now easier and more personalized! AirRadar allows you to scan for open networks and tag them as favourites or filter them out. View detailed network information, graph network signal strength, and automatically join the best open network in range. Whether you are driving around looking for wireless networks, stuck in traffic, sitting on the beach, or if you are curious how strong your wireless signal is at home, AirRadar provides a more linear approach to network hunting. Setup a scan frequency, and have new open or closed networks have their name spoken, play alerts, or display notifications. Various other options allow you to customize your network list further, including assigning colors to best open networks and sound cues. Download it today, and take the hardship out of getting an internet connection at a critical time.

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Functionality
Automatically scan on launch
Play sounds after scanning, or for new networks
Remember scan history
Ad-hoc network scanning
Adjust scan interval
Set a maximum retention for out of scope networks
Speak new network names
Auto-join open networks with a good signal
GROWL support
Mark favourite networks
Filter out networks
Colorize networks based on status and type
Graph network noise and signal strength
Comment on networks
Export network lists
Join both open and closed networks
Disconnect from a network without turning off AirPort
Information Retrieved:
Ad-hoc status
Beacon Interval
CF Pollable Flag
CF Poll Request Flag
Channel
Channel Agility Flag
Encrypted Status
Encryption Type (WEP, WPA, WPA2, None)
Encryption Cipher (AES, TKIP)
First Seen
Last Seen
MAC Address (BSSID)
Managed Flag
Miss Count
Name
Noise Level
Reserved Flag
PBCC Flag
Signal Strength
Average, Min, and Max Signal Strength
Short Preamble Flag

Compatibility
Mac OS X 10.6 - 10.8.4 (Mountain Lion)

Developer
koingosw <-- they make some really good apps. You must check them out.