Sure you can get 30 feet of HDMI cable for $35 from monoprice, but the coolness factor of the $800 Gefen EXT-WHDMI, a wireless HDMI system with a 30-foot range, cannot be denied. And according to our tests, the system actually works--albeit not quite as flawlessly as the cable.
The idea behind wireless HDMI is that some installations, particularly wall-mounted flat-panel TVs and ceiling-mounted home theater projectors, just don't look right with scads of wires dangling from the bottom. To hide those wires you typically have to pay an installer scads of cash to run those wires through the walls between your display device (TV, projector) and source components (Blu-ray player, cable box, etc).
The Gefen EXT-WHDMI is one of the first wireless HDMI systems available, and it eliminates the need to run wires through walls. Its relatively short range means it's not designed to transmit across the house, or even from one room to the next, but the transmission is strong enough that you can hide the receiver behind a TV.
Our testing, which compared the Gefen EXT-WHDMI directly with the Sony DMX-WL1, did reveal some differences. The Gefen introduced a bit of false contouring, an artifact we found somewhat more objectionable than the Sony's flaws. But the Gefen remained more stable, and it handles the current holy grail of video formats, 1,080p/24, whereas the Sony maxes out at 1,080i.