Meet the Airtame: a wireless HDMI adapter that plugs into the HDMI port on your TV or projector and connects to your WiFi network to wirelessly mirror your desktop or let you present from mobile devices. You will be able to stream to multiple screens. Airtame is compatible with Windows, Mac, Android, iOS, and Linux devices. It offers dual band operations.
Airtame lets you see your entire desktop on your TV. It supports WPA2 Enterprise networks. Costs under $200 at this time.