Digital terrestrial television

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Digital Terrestrial Television (DTTV or DTT) is an implementation of digital technology to provide a greater number of channels (SDTV) and/or better quality of picture (EDTV, HDTV) and sound (AC3, Dolby Digital) through a conventional antenna (or aerial) instead of a satellite dish or cable connection. The technology used is ATSC in North America, ISDB-T in Japan, and DVB-T in Europe and Australia; the rest of the world remaining mostly undecided. ISDB-T is very similar to DVB-T and can share front-end receiver and demodulator components.

http://en.wikipedia.org/wiki/Digital_terrestrial_television