GefenTV uses wireless 802.11n to do its thing and operates in the unlicensed 5GHz band to transmit HDTV. For sure the GefenTV isn't for everyone; if your HDTV isn't wall mounted or your A/V components aren't separated away from the display, there's little need to pay this price just to hide the cables. But if you're looking to cut loose without giving up on HD, it sure beats running cables under carpets or along baseboards, or poking holes in walls or ceilings. So while it might be called a "one-trick pony", it's fair to say that the GefenTV does a competent job of delivering high-definition video and multichannel audio through the airwaves.
Discuss "GefenTV Wireless HDMI Extender 5 GHz Review" here. Read the article.
"To begin, nothing on the units indicate which is which, but it's pretty obvious which is the Sender and which the Receiver once you look at the connections on back. The Sender has a HDMI output and a plug for power, while the Receiver has a HDMI input, plug for power as well as left/right analog audio outputs (note: this output is only active when the audio being carried along by the HDMI source is 2 channel LPCM)."
I think you have that backwards; the Sender has the HDMI input, and the Receiver has the HDMI output. Which kind of calls into question how "obvious" it is.