Dooku is shown here trying to get a broken TV to work, with Grievous standing in as an antenna. A TV was a technological device. When Greedo the Rodian rotated the sensory equipment on his head, it looked like satellite dishes searching for TV channels.
Count Dooku watched the battle of Kashyyyk on one of these bulky televisions. Since the device was malfunctioning, he asked General Grievous to stand in as an antenna, which made the picture better.