The comment about turning off the bedroom light is referring to using the LED LIGHTS in the bedroom ceiling lights. Some of the LED brands that have a regulator chip in the LED Board or BULB seems to interfere with the TV sets. The regulator chip produces RFI that will wipe out the incoming HDTV signal.
So when scanning for digital signals be sure to turn off the bedroom light. I would turn off all the ceiling lights if it were me... Once you see some digital stations then you can experiment with the lights to see if they prevent you from seeing your TV.
You should start seeing digital stations start being counted right away.
Roy ken