The Tv must scan for the Digital Broadcast Tv Channels , sometimes called the 'Air Channels' or 'Antenna Channels'. . Do Not scan for cable tv channels. If you will like to receive several crystal clear digital channels while waiting for the outside antenna and etc. to arrive. If you have a simple indoor antenna like this ,
http://www.radioshack.com , Budget Tv Antenna # 15-1874 . Here is how to aim a rods and loop indoor antenna ,
http://www.kyes.com/antenna/pointing/pointing.html. . If you have trees in full leaf in the direction 228 degree magnetic compass the signal will be reduced. If the house is wood frame with wood or vinyl siding , that is the best for reception with indoor antennas. Metal siding , stucko with stucko Wire , concrete , concrete blocks , bricks from ground to roof , solar panels , will reduce reception.