I always thought the sensor bar was the one sending information to the Wii, but it turns out the only thing it does is send two infrared (IR) signals. The Wiimote makes use of those two signals to triangulate its position.

As you can see in this video, the guy uses two TV remotes to send the two IR signals needed for the Wii to sense its position and movement.

I give it about a month before we see a DIY video on how to build a wireless sensor bar.

Would you get a wireless sensor bar if one was available?

Update: PadLach submitted:

With all this news about the sensor bar and the Wii-mote, I thought I should pass along this tidbit I just disocovered while playing around with my Wii settings. While tuning my sensor bar’s sensitivity, I noticed that I had 3 dots on the screen instead of 2… at first I was puzzled, but then I noticed that my girlfriend had lit a tealight candle on the coffee table and that was the 3rd dot. I got a second candle, removed my sensor bar and placed the 2 candles on top of the TV… sure enough, the candles gave off enough of a signal for the Wii-mote to pick up and be usable (not perfect, but useable if in a pinch.) I just wanted to pass this along to you guys so you could pass it on to the other rebels… it also shows that a wireless sensor bar is more than possible with no problems.