Over-the-air full-power analog US TV ends by February 17, 2009. Check out http://www.dtvanswers.com for additional information. If you currently watch TV on an analog TV set that is not connected to cable, satellite, or other pay TV service, you'll need to do something - either get a newer TV with digital tuning or apply for ( https://www.dtv2009.gov ) up to two $40 discount coupons towards certain basic converter boxes to let you keep using your old analog sets. The coupons expire 90 days after they're issued. Government rules allow pre-orders using the coupons as long as the boxes will ship within 60 days of the pre-order, but it's up to the retailer whether they offer this.
http://antennaweb.org/ will let you put in your address and see what stations (analog, digital, or both) are in your range, what type of antenna you'll need, and which direction you'll need to aim it if you need a directional antenna.