The telescope that uses an antenna and a receiver to study the stars is a radio telescope.

Here's why:

* Antenna: Radio telescopes use large, dish-shaped antennas to collect radio waves emitted by celestial objects.

* Receiver: The collected radio waves are then amplified and processed by a receiver, which converts them into signals that can be analyzed.

Radio telescopes are different from optical telescopes, which use mirrors and lenses to collect visible light.

Let me know if you'd like to learn more about radio telescopes!