The transmitter site was inaugurated on 27 August 1927 and started broadcasting the first channel of Danish radio on 243 kHz longwave (LW) with 300 kW.

They resumed in Digital Radio Mondiale (DRM) mode at reduced power (200 W) on 3 October 2008 after substantial modifications to the aerial earlier that year.

By connecting the receiver to a stationary or a maritime wire, frame, or active antenna, reception improved up to 1,500 km of range.

[3] Every year on 4 May, Danmarks Radio rebroadcast the "message of liberation,"[4] from the Kalundborg transmitter in an hour-long memorial broadcast that began after the news at 20:00.

The LW antenna was an Alexanderson aerial with two grounded 118 m steel lattice radiating towers connected by top capacitance wires.