Maybe the current position where your antenna is placed, is not good enough for picking up TV signal. Try moving the antenna to a different and higher position and then try rescanning for TV channels.
Most of the indoor antennas have a signal booster which strengthens the antenna's capacity. In order for it to work, the antenna's power cable needs to be plugged in a power outlet. Make sure that the antenna's cable is plugged in a power outlet and that the antenna's LED indicator glows and then scan for channels.
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