The RKS Liblice 2 are two 355 m (1,165 ft) tall guyed masts located east of Prague near Liblice, in close proximity of the RKS Liblice 1. These lattice steel towers are built 120 m (390 ft) apart from each other, at which cage aerials are mounted. Designed by Jan Šťovíček, these supertall towers currently stand as the tallest towers in the world used for broadcasting in the mediumwave range. RKS Liblice-2 was built in 1976, and is currently used for broadcasting on 639 kHz. During construction, two new transmitter devices of the type Tesla SRV 750 with an output power of 750 KW were installed. In regular operation these transmitters are switched in parallel for a transmission power of 1500 KW.