If you have a indoor tv antenna, hook it it up. If you do not, then straighten out a metal paper clip, stick it in the hole on the antenna connection on the TV, the bend the part sticking out up until you make an L. Scan for channels per the TV manual.
Hopefully you will pick up a couple of local stations.
http://www.instructables.com/id/Paperclip-Antenna/
http://tvstreamin.com/forum/index.php?topic=584.0
A longer wire up to a foot long will catch a better signal. These digital stations occupy the old UHF band.
Thanks!