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Firebase Realtime database supports three types of broadcasting patterns:

1. Value events: This type of broadcasting pattern is used to retrieve the entire contents of a Firebase Realtime database. In this pattern, the callback function is called whenever the data at the specified database reference changes.

2. Child events: This pattern retrieves a subset of the data from a Firebase Realtime database. The callback function is triggered when any child is added, removed, or changed.

3. Query events: This pattern retrieves a subset of data that meets a certain condition, such as filtering by key or value. The callback function is called whenever the data that matches the query changes.

All of these broadcasting patterns use the Firebase Realtime database's powerful synchronization capabilities, allowing clients to receive real-time updates as soon as data changes on the server.