Terrestriaalilähetyksiä

Terrestriaalilähetyksiä refers to terrestrial broadcasting, a method of transmitting television and radio signals via ground-based transmitters. This is distinct from satellite broadcasting or cable television. In terrestrial broadcasting, signals are sent out from antennas at high elevations and are received by individual antennas, commonly known as "terrestrial antennas" or "rabbit ears" for older television sets, or rooftop aerials.

The broadcast spectrum used for terrestrial transmissions is allocated by national regulatory bodies. Historically, terrestrial broadcasting was the primary method for distributing television and radio programming to households. It allowed for widespread access to content, particularly in areas where cable or satellite infrastructure was not available.

However, the rise of digital terrestrial television (DTT) has largely replaced analog terrestrial broadcasting in many countries. DTT offers improved picture and sound quality, more efficient use of spectrum, and the ability to carry more channels within the same broadcast bandwidth. The transition from analog to digital required consumers to upgrade their receiving equipment, often necessitating the use of set-top boxes. Despite the advancements, terrestrial broadcasting continues to be a significant part of the media landscape, providing a free-to-air option for many viewers and listeners.