
RT-64 are two radio telescopes in Russia with 64-metre (210 ft) antenna diameter which are among the largest radio telescopes in the world.
The Bear Lakes RT-64 radio telescope at the Bear Lakes Satellite Communications Center is located in Medvezh'i Ozera, Shchyolkovo, near Moscow.1 The Kalyazin RT-64 radio telescope at the Kalyazin Radio Astronomy Observatory is located in Kalyazin.1