The Lahti longwave transmitter was a facility for longwave transmission on the Radio Hill in Lahti, Finland on 252 kHz. It was inaugurated in 1927 and used a T-type aerial strung between two 150-metre-high (490 ft) freestanding steel framework towers. The Lahti longwave transmitter was shut down in 1993. Nowadays the facility is used as a museum. The red-and-white towers are still standing and form a local landmark. Nearby is lake Mytäjäinen.