I enjoy listening to the pros at Air Traffic Control do their jobs so well. I have setup a ATC scanner that covers these channels and streams at:
|121.35||Champaign Approach (North)|
|132.85||Champaign Approach (South)|
|128.75||Champaign Clearance via Chicago Center|
|123.0||C16 Frasca Airport CTAF|
|133.975||Champaign Departure Secondary|
Feel free to listen and share. On desktop you can listen in browser or iTunes, etc. On iOS FStream or VLC apps work nicely, just enter the streaming URL above under network streams.