The 1x8 and 3x8 Bi-directional RF Splitters provide better signal quality on all the home's TVs and save space in the enclosure. Plug the incoming signals fromthe CATV, satellite (after set-top box), or antenna into the input. Auxiliary ports 2 and 3 on the SAM-RFBA38 can also be used for other modulated signals fromDVD/VCRs or security cameras. Then plug the power adapter in and you're ready to start enjoying better video quality throughout the home.