Meet the SIIG 10×1 1080P Wireless HDMI Extender: a handy tool that wirelessly extends your HDMI signals with stereo audio up to 66ft. It can work with up to 10 HDMI displays. It supports resolutions up to 1080p @60Hz.
This device relies on wireless 5GHz technology to extend your HDMI signals. It is available for under $260 at this time.