FLYMEI&reg; High Gain Low Noise HDTV Antenna Amplifier Signal Booster for Indoor Antenna with USB Power Supply, Boost Any Non-amplified TV Antenna up to 15 Miles Range Gain 20dB - Black Channel reception will vary depending on how far away you are from broadcast towers, and your surroundings. Optimized for digital reception: This High Gain TV Antenna Amplifier will strengthen the signals weakened by the obstructions between you and the towers, make your TV pictures are more clear but cannot get more channels. If your house is very close to the broadcast tower and the existing signal is very strong, we do not suggest you use signal booster because overload your antenna may result in fewer channels. Supply 15 Miles boost Range and 20dB high Signal, buy with our 35 Miles Range Antenna together and enhance signal range up to 50 Miles. Please go to "dtv.gov/maps" to check out what channels are available in your area and how many you can get before placing your order. USB Powered Amplifier: Ideal for portable digital devices with USB ports.