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Indoor TV Antenna Specifications: Frequency range: 47-230MHz, 470-862MHz Receiving range: FM/VHF/UHF Gain: 28dB Output Level:100dBμV Impedance: 75Ω Power Supply: Via USB Power Adapter(5V/100mA) Please Note: 1. For flatscreen HDTVs, please check the TV's manual to make sure the TV has a built-in tuner for receiving over-the-air broadcast, and make sure this tuner can receive HD signals or else it will not be able to receive and watch HD channels. 2.Retune your TV and/or digital box from time to time to ensure you are receiving all available services. Retuning takes only a few minutes using the remote control. 3.Antenna signal strength can vary depending on distance from the tower, terrain, and weather. Reposition the antenna in a different location if needed. It is best for the antenna to be in line of sight with the TV tower(s) and avoid obstructions. Always re-scan for channels after moving the antenna. 4. If your TV has no built-in tuner, you can add an ATSC digital converter box to receive the HD signal.