I've used SHOUTCast for years now and wouldn't even dare to think of using another program to broadcast radio stations with.
Reviews of Nullsoft SHOUTcast for Windows (32-bit)
Nullsoft SHOUTcast Server will accept connections via SHOUTcast DSP Plug-in in order to have a SOURCE Stream to broadcast. Once a stream has begun, the server will only accept connections from other copies of Winamp in order to broadcast that source stream to each listener. In effect, having a micro-broadcast system to allow people to be able to broadcast any content in any of the formats that Winamp supports. Through the use of specialized broadcasting plug-ins, audio from a microphone as well as any device attached to the Line-In port on the broadcasters soundcard can be streamed via SHOUTcast Server.
Nullsoft SHOUTcast for Windows (32-bit) Free Download and Reviews - Fileforum