The TV/television is located in the Living Room on Chibi-Robo!. It appears to be on all the time, receiving two channels during the day (news and the Drake Redcrest Show), and no signal during the night. One of the minor tasks for Chibi-Robo is to change channels for Mr. Sanderson as the story progresses.
Later toward the end of the game (when all stickers are collected), Chibi-Radar seems to always detect something at/behind the TV channel changer, but nothing is revealed with Chibi-Blaster or spoon. (However, knocking on the channel changer with the spoon seems to cause Mr. Prongs to appear in the next round?)