Direct tv box - DirecTV

My house is wired for cable, with 1 coax line ran to each room with the amp splitter in the garage where the main cable line comes in.
My question is; will all this need to be changed or re wired?
Does the direct tv box use 1 coax line for each box?

This question, "Direct tv box," is about DirecTV channels, programming, equipment, and sports.