Gefen's latest rendition of wireless HDMI using 802.11n 5 GHz uncompressed radio technology opens up new doors for wireless video distribution. The new GTV-WHDMI along with some extra receivers can create a wireless digital signage network of multiple mirrored screens. The kit itself with one transmitter and one receiver goes right now for $674.95.

It uses 802.11n, a similar technology to wireless networks, only on a different frequency band: 5 GHz instead of 2.4 GHz. This is good if most of the devices in your immediate area are within the 2.4 GHz band (like wireless routers, wireless device servers, remote controls; luckily most of these are usually made in the 2.4 GHz band).

Using this radio technology makes it easy to broadcast a circle-pattern signal with a radius of 100 feet in open spaces. Also, unlike the UWB (ultra wide bandwidth) predecessor, it travels through multiple walls while preserving a perfect image and sound quality, and makes it look easy. Within this 100 ft radius circle, it can communicate with up to 5 other receivers simultaneously, creating an easy-to-manage and extremely easy-to-install 1080p/30 fps (or 1080i/60 fps) digital signage network without wires. All that's required in order to set up is to plug the sender and receivers into wall sockets and into the source/displays they sit near.

There are two main drawbacks to Broadcast mode (this is a mode that is switched on and off on the rear of the units). When broadcasting to multiple receivers, it does not support HDCP. In Unicast mode (one transmitter to one receiver mode), HDCP is supported. This means that broadcast mode is recommended for applications that include a DVI source, like a computer connected to the wireless HDMI system via DVI-HDMI cable, where HDCP is not an issue. The other main drawback is that you are limited to just mirroring one video source on many displays. In order to route different video feeds from different sources to different displays at different times, you're going to need a different system, say, one that includes a matrix switch. However, this solution is perfect, simple and relatively inexpensive for someone wanting to run multiple digital signs from a single computer source on multiple HD screens with the same video running on each.