One possible compromise that leaps to mind is to have the radios be encrypted, but they all feed into a several-hours-long buffer and get automatically decrypted and published after that delay. You wouldn’t be able to stalk police or whatever, but they wouldn’t be able to hide malfeasance or incompetence from the public.

It’s not perfect, there are still good transparency reasons for knowing what the police are doing right now, but it might be a good enough balance.