Installation of terrestrial antennas: The terrestrial digital television in Greece follows the DVB-T standard. The antenna, in order to ensure a correct input signal to the receiver, must be correctly positioned and oriented. Installation of satellite dishes: The satellite reception can include from 1 to 4 satellites and its signal is routed through internal small switches, controlled by DiSEqC commands. The adjustment of the satellite mirror is done with the aid of special instruments and equipment, which ensure the correct operation and quality of the installation.