"Broadcasting in the American Sector" (RIAS) was also popular in East Germany. In 1953, efforts were made to halt the RIAS's "reactionary propaganda" using radios which only received broadcasts from the GDR. At the same time, jamming devices were used to obstruct radio reception from the West. In the autumn of 1953, 10 2-kW transmitters were interfering with Western radio programs. These transmitters were based in the radio station at Köpenick.