video component cable length

I'm thinking about tapping off my cable box to send component video and audio output to another room. I have a remote extender in place already. The run is about 30 feet.
Anyone have experience with a run this long? Will this cause adverse effects in picture quality? I was also considering a product from AI tech (wireless cable) http://aitech.stores.yahoo.net/wicatv.html
Anyone have experience with this product?
thanks to all!