Sobetter-High Gain Low Noise HDTV Antenna Amplifier Signal Booster for TV HDTV Antenna with USB Power Supply, Boost Any Non-amplified TV Antenna up to 15 Miles Range Gain 20dB Color Black The number of channels you got in your area is determined by what's being broadcast in your area. Channel reception will vary depending on how far away you are from broadcast towers, and your surroundings. The amplifier/booster can enhance the signals weakened by the obstructions between you and the towers, but can not add signals. Check out what channels are available in your area and how many channels you've got. If your TV picture is not crystal clear, or you can not get the weak signals from far away towers, you can use this amplifier to boost the weakened signals. We do NOT recommend to use this amplifier/booster if your house is very close to the broadcast tower and the signal is already very strong. A booster will cause self-oscillate and you may get fewer signals than without. We DO offer a 30-day money back guarantee in case of this booster doesn't help.