Where do you want to site the antenna? What is between that site and the stations - trees, concrete wall, another building? Can you point the antenna at the transmitters (ie due north?)
One possibility is to go to Walmart and pick up a pair of rabbit ears today. Connect them to your TV and see what you get. If they don't work out, you can take them back and get a better antenna either at Walmart or elsewhere -
http://www.walmart.com/c/kp/indoor-antennas