Signal receivers are devices used to capture and interpret signals from a variety of sources. Antennas, which are 8 letters long, are one type of signal receiver that can be used to pick up radio waves. Aerials, which are 7 letters long, are another type of signal receiver that can be used to pick up television signals. Tuners, which are 6 letters long, are used to select the desired frequency of a signal. Satellite dishes, which are 15 letters long, are used to receive signals from satellites in space.