The brite-View Air Sync HD is a $200 transmitter/receiver designed to feed an HDTV wirelessly from any HDMI source. However, with a resolution of 1080p, a range of up to 100 feet, and claimed zero latency, enterprising filmmakers have discovered that it can be used DIY-style to create a budget video village. Here's a look at the device in action with a RED camera:
As you can see, it's not the best for handheld monitoring, but it could certainly work as a stationary director's monitor, especially if the camera is on a steadicam or car mount where tethering isn't possible. It appears that running it off a Canon LP-E6 battery, as seen in the video, will require an adapter which is not yet released; however, if you're setting up a video village you will almost certainly have a power tap nearby anyway. The unit is available at Amazon for $199; more info on brite-View's site.