you want a coaxial cable splitter which look like this

http://www.google.com/products?q=coaxial...

then attach like this

http://www.ehow.com/how_5219034_install-...

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they just screw on to the end of a cable, much like the end of an extention cord with mutiple plug ins at the end, but insted of a plug in connection it's a screw in connection