This Beta has screw-on type RF connectors for use with coaxial cables or adapters. The connector marked IN is for receiving an NTSC TV broadcast signal for VHF, UHF or cable. The OUT connector sends out an NTSC TV broadcast signal for either channel 3 or 4. It is selectable using a switch (usually on the back) for whichever channel is not active in the area. Selecting a vacant channel is to avoid interference from an adjacent station. ©Misterßetamax go to homepage