The scope of this question is a little bit beyond this forum (AVSforum may be better ) as there are just so many variables but in general:
There are two components, the wireless network itself and getting the tv signal onto the network.
For a wireless video network you really need to think about a dedicated setup that isn't shared by every other device in the house. 5GHz-N networks often work best as they have the least interference from other devices however you can make a normal wireless N work if you pay attention to distance, use directional antennas etc. Distance is the primary factor that will determine how many HD data streams you can support; one is easy, multiple requires more attention to detail.
The second issue is getting the video signal onto the network. Depending on what you want to use as a source device, a sling box works fairly well. If you are dealing with unencrypted ClearQAM content, an HD Homerun is excellent. But be aware the industry is moving away from non "copy-protected" and non-encrypted content making media distribution far more difficult that it was in the past.
The combination of Windows 7 media center and Xboxes as media center extenders can handle just about any content (even most encrypted) using cable card tuners. MythTV and a cablecard tuner can handle content that does not have too many copy protection flag restrictions on it.
There are some, and most are of low quality, so if you pick on up, make sure you can return it.
Here's an example LINK . Others are also available by doing a online search for "wireless TV transmitter"
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