Here is an interesting article. I wonder if Milwaukee will ever stop encryption on Open Sky. I myself doubt it but having the public and news media to be able to monitor I think in most cases can be a good thing. This article states that if they want to encrypt some traffic that is not meant for the public they would do that but other than that, all communications would be open to monitoring.
Mayor turns off encryption of Washington DC Fire Radios - Philadelphia In Pictures | Examiner.com
Mayor turns off encryption of Washington DC Fire Radios - Philadelphia In Pictures | Examiner.com