All TVs including new ATSC Digital ones use the same frequencies as older NTSC Analog sets. An amplified antenna is recommended because there is a threshold where a weak analog signal will be visible (with considerable static) but a digital tuner will not have sufficient strength to display a digital (no noise or static) picture. Outdoor roof Antennas work great as well, you don't need an HDTV antenna, discount stores should have one for around $30.
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Analog signals of US television programming will end February 19, 2009. The formatting will change to digital, which will require a cable box to decode the programming.
Adam Beach
To represent signals back to client during data transmissions.
Rush's 1982 album "Signals" features a dalmatian on the cover.
"This Is What It Means To Say Phoenix, Arizona."