In the United States, where most full-power television stations are already broadcasting both an analog and a digital signal, the FCC has set June 12, 2009 as the date on which all analog transmissions will cease and over-the-air broadcasts will be solely digital. By special dispensation, some analog TV signals ceased, as previously scheduled, on February 17, 2009 and earlier in Hawaii. However, US President Barack Obama delayed the introduction of digital TV in most areas as part of an economic stimulus package so that the switch occurred on June 12, 2009.
There are a number of different ways to receive digital tv (digital television). One of the oldest means of receiving Digital TV (and TV in general) is using an antenna (known as an aerial in some countries). This way is known as Digital Terrestrial Television (DTT). With DTT, viewers are limited to whatever channels the antenna picks up. Signal quality will also vary.