Therefore, a blackout affects any market where the terrestrial broadcast signal of an affiliate station, under normal conditions, penetrates into the 75-mile radius.

Included are any non-profit terrestrial broadcast community radio stations not directly affiliated, owned, controlled by any radio network, school, company, or government.

It will also use fibre networks, other communication satellites, and terrestrial broadcasts, as well as elements of the present satellite network.

Laws about antennas were updated before the change to digital terrestrial broadcasts.

In other cases government policies have been introduced to encourage or force the switchover process, especially with regard to terrestrial broadcasts.