Yes, there is. It's called a wireless A/V transmitter. On a small scale, it works the same way as a TV antenna only instead of a local broadcast station sending a signal out to anyone who has an antenna, the TV in your living room will be the sender of the signal for the receiver in your bedroom to decode.
The way it works is connect the television in your living room to the transmitter, and the TV in the bedroom to the receiver. The signal travels through the open air, and is decoded by the receiver in the bedroom. My advice is to have the transmitter and receiver in as open a space as possible to avoid any interference.
A company called Terk makes one called the LF-30S. While I haven't used a wireless A/V transmitter, I did use a wireless camera on many occassions. The signal wasn't as good as if it were hard-wired, but it still looked pretty good. I imagine much the same with this product.
If you have any comments or questions, please email me at tv.guide@about.com.
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