By using a balun at each end of a UTP cable you can obtain the following enhancements: lower material cost (CAT5 versus coax cable), reduced install labor (pull time or cable may already be there), longer cable runs (passive up to 2000 feet, active up to 1.5 miles), more versatile (4 cameras on 1 CAT5 cable), future proofs system (can IP address the entire analog system plus cable in place for full IP digital system upgrade)