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I operate/program the Community Radio system for the City of Cuyahoga Falls, Ohio. The station is part of an outdoor siren warning system. When you hear the sirens, tune to 1650 AM for an emergency message.
Our programming runs on ZaraRadio automation at my office/shop. Using a dedicated IP audio streamer, the programming is carried over the City’s intranet about three miles to where our transmitter is located.
The streaming devices are called the Extreamer (transmitter) and Instreamer (receiver.) They were expensive but very stable having never crashed in over a year now.
The bit rate and compression are adjustable as MP3 allows.
I started out using Windows Media Encoder on my desktop PC and the receiving end was a laptop running Windows Media Player. The stream would occasionally stop usually due to Windows forced updates.
When no emergency exists, I run weather and local activities information. The station is allowed up to 10 watts provided the signal does not exceed the specified strength measured at 1.5 km from the antenna.
You could use something like Shoutcast and WinAmp to stream over the internet if you have reasonable bandwidth at both ends. I use Shoutcast for my webcasting.