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A cable TV amplifier is also known as a signal booster. A signal booster is commonly used to improve the picture quality of a television that is connected via a home antenna. People who usually purchase a cable television amplifier usually have three or four televisions that are all connected to your incoming cable or satellite.
If you have a snowy-looking picture and you have your cable connected via a home antenna, you may wish to install a cable television booster to lessen the snowy effect and make a brighter, clearer picture. If this is something that you think you may need, see a local electronics store assistant for more information.