If you can use glass optical link (ST type or AT&T), anything less than 2 km will not have any loss..
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I have all my electronics in the back of the room. About 2 years ago, I bought a Monster 10 meter (33 Ft.) S-video cable for a little over $100. I placed my Sony DV-300 DVD player in front of my 35" tube TV and alternated between the Sony supplied 24" S-video and the 10 meter S-video. I could not notice a difference even in freeze frame. In comparing composite between S-video, I could only barely notice a difference while the DVD was playing. In a blind test, I would struggle noticing the difference. However, in freeze frame, the difference was quite noticable. Images were sharper and colors more brillant with S-video--even with the 10 meter S-video run.
I have all my components in the front of my room in a recessed 2'x8' bumpout, and run a 50' set of component cables from a Sony DVP7700 to a Sony VPLW400Q LCD front projector located in the back of the room. The picture quality is excellent. I've also run composite and s-video with lengths of 25 - 35 feet. I found that the picture was better if you run a long length of composite and convert the single to s-video just before the projector. Running a 35' s-vieo cable washed out some of the color by comparison.