Portavision Portable VHF/UHF TV/Monitor (160-0244) Connections Faxback Doc. # 31788 Cable TV Connection To connect a 75 Ohm coaxial cable from a cable box , you need a 75 ohm-to-mini-plug adapter (Cat. No. 278-0257). Connect the cable to the adapter. Then, plug the adapter's mini plug into the TV/Monitor's EXT ANT jack. (IR-04/03/96)