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.
Maybe the indoor antenna is not strong enough to pick up TV channels. In this case, the wisest course of action would be to install an outdoor antenna.
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