Do you obligation an antennea for your TV even if you own a built within digital tuner?
Answers:
Of course you do, possibly better than for analog, though in obedient signal areas, digital may be possible with a set top antenna.
The site down has a appropriate UK DVB signal predictor - http://www.wolfbane.com/cgi-bin/tvd.exe? Not enough information. Are you getting cable or over-the-air TV. For OTA, you have need of some kind of antenna, from rabbit ears to a rooftop section, depending on distance from you to the transmitters. Check antennaweb.org for your location (US only)