Take a look what i just found at amazon:
Their description:
Product Description
This is a brand new, four (4) port cable television drop amplifier, just like the ones that your local cable company uses to correct their system’s shortcomings. This new model packs a powerful punch in a compact, easy-to-install package! By connecting these fantastic signal boosters to the drop cable coming in from the street, you can increase the signal strength entering your home by up a whopping +7 db per port! If you have multiple televisions or run a cable mod… More >>
Go & get it here - i can recommend it:
4 PORT CABLE TV / HDTV / DIGITAL AMPLIFIER INTERNET MODEM SIGNAL BOOSTER INTERNET AMP