Wsky High Gain Low Noise HDTV Antenna Amplifier，with USB Power Supply，Gain 20dB Color White<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>The number of channels you can receive is determined by what's being broadcast in your area. Channel reception is dependent upon distance from broadcast towers， terrain， surroundings， and weather.</li><li>This amplifier/booster can enhance signals weakened by obstructions between you and your local broadcast towers but it can not add new signals.+</li><li>Check out what channels are available in your area first and how many you are able to receive. If your TV picture is not crystal clear， or you cannot receive the weak signals from far away towers， use this amplifier to boost the weakened signals.</li><li>We do NOT recommend using this amplifier/booster if your house is very close to the broadcast tower and the signal is already very strong. The amplifier may cause self-oscillations and result in fewer signals received.</li><li>100% SATISFACTION GUARANTEE: Wsky HDTV antenna amplifier comes with a 100% Satisfaction Guarantee. Wsky is dedicated to address any product &amp; service issues and committed to delivering a 5 star experience for all buyers!</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31qRRBgzS6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41LqG6oYszL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/511tne1Pg2L.jpg" noproxy>