Grimeton SAQ, the oldest operational radio transmitter in the world, is having its traditional Christmas transmission December 24th 08:00 UTC (09:00 CET) on 17.2 kHz. There are many ways to listen to it, including hooking a loop antenna into your PC's soundcard, but the easiest nowadays is probably to use a WebSDR like http://websdr.ewi.utwente.nl:8901/.