Is a special antenna required for digital TV?

No. In fact, there really is no such thing as a "digital" antenna. Companies that make TV antennas put things like "HD ready" or "Digital TV ready" as a marketing scheme to get consumers to upgrade or replace their existing TV antennas. The truth is this: There is no difference between antennas used for analog TV and antennas used for digital TV. Digital TV channels operate on the same frequencies as analog TV channels. Digital TV just uses less bandwidth due to the ability to compress the signal. You may find that you do need a better antenna, however, if you watch any stations with a weak signal. This is because a poor digital signal causes the picture and sound to break up. It is much more frustrating to watch TV with "broken up" digital video and audio than an analog signal with "snowy" video and audio.