I only plan on running coax to three locations, one wire for each. I originally thought I could just buy a 4-way powered amplifier/splitter, but now I'm not so sure.

GE Digital 2-Way Coaxial Cable Splitter, 2.5 GHz 5-2500 MHz, RG6 Compatible, Works with HD TV, Satellite, High Speed Internet, Amplifier, Antenna, Gold Plated Connectors, Corrosion Resistant, 33526 ...

If there is more than just 2 output legs, you need to get another splitter so that there are only 2 ways the upstream can go (and use the filter on the other line).<BR><BR>Also, make sure that ...