Your television has a HD tuner built into it, all you need is an antenna. As far as which antenna, that all depends on where the broadcast antennas are in relationship to you, distance, obstacles like mountains, are they all in the same direction. There used to be a website that would locate where the antennas where in relationship to you and would recommend what kind of antenna to get.

All that being said, all of the indoor antennas are pretty hit-or-miss. If there is too much interference or distance between it and the broadcast antenna, you won't get any kind of reception. For example, I did one here in Houston for the Superbowl at the beginning of the year, TV was on a cart and wheeled out in the garage, I was able to pick up about 14 off-air channels, but only 2 were major networks, the rest were small time, spanish, or shop at home stations. That was just using a basic amplified Terk indoor antenna.