Radio or TV interference occurs when a high frequency signal distorts the incoming signal to the cable or antenna input of televisions and radios. Cordless telephones can also be affected. The causes of these problems can be easy to identify. When a common appliance generates electrical noise that interferes with the TV or radio, it's easy to match the cause with the problem.

Unfortunately many of the causes of interference can not be seen or heard. Interference sources may originate inside the home or can result from certain environmental conditions. Finally, interference can be caused by activities in your neighbor's home or elsewhere in the electric utility's system.