Many computers don't have a connection compatible with a coax cable. If you want to connect a coax so you can view the source on a computer display without this necessary connection, you can use a Coax over HDMI converter box. This box translates signals streaming in from the coaxial cable for the connected HDMI cable so they can be displayed on the computer. The converter boxes range in price and can be purchased from a variety of different retailers.
Connect one end of the coaxial cable into the cable box, TV or other output device.
Connect the coax cable to the coax connection on the HDMI over Coax converter box.
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Insert one end of the HDMI cable into the HDMI port in the converter box.
Insert the other end of the HDMI cable into the HDMI port on the computer, or other input device.