"Broadcasting over the Internet is a scary thing to do on your own. A single low-quality stream will be 128kbps for each user, and anything approaching a reasonable quality will be at least 256 kbps. Even high-speed connections like FiOS (or your local fiber-based ISP) would start to falter at having 3 users connected.
There are commercial services, some free, some not, that handle streaming live video very well. If you want to broadcast on your own to your friends, a service like UStream or Justin.tv will work great; for a situation where you want to chat amongst your friends, Stickam is a great service.
A bonus for all three services is that they use Flash to serve the video -- your friends won't have to install any special streaming software to watch. This is a definite plus since most dedicated streaming software is either very poor quality, filled with spyware/adware, or both."
"If You need to broadcast it locally, you can do it without Internet connection. You can broadcast analogue signals which can be seen on any Analogue/Digital TV with an antenna and in range. You have to buy a analogue broadcast kit (AV Broadcasters). You can buy that from Amazon. Then just connect it to a video source and you are ready to go. A cheap broadcaster can broadcast up to few meters and a expensive one can do it for some kilo meters."