Shield Your TV Cables If you use a TV set rather than a monitor for your video display, you might have trouble with wavy lines and the like on your screen. The key to eliminating them lies in the cable that connects the computer to the TV. It should be in good condition, and totally shielded if possible. If your TV is set up for a 300 ohm twin-lead, you should have a 75 to 300 ohm coupler between the terminals and your computer cable. It's often useful to coil the cable and tape it into place. It usually helps if you take the TV/Computer switchbox out of the circuit, or use some other method to remove the TV antenna connection whenever you're computing. Radio Shack and similar stores have a wide array of connectors, cables, switches and filters for TV and video connections. The store manager can help with your selection.