Recording of Radio Mystery 21, October 15, 2021 at 1827 UTC (shortwave frequency of 4870 kHz)Station: Radio Mystery 21Place of reception: EuropeFrequency: 4870 kHz shortwaveDate: October 15, 2021Time: 18.27 UTCTransmitter location: unknownTransmitter power: unknownReceiver: SONY ICF 2001D (running on batteries - to evade noise from power mains)Location of receiver: in the buildingAntenna: 1,2 meter CB-radio antennaAntenna location: outdoor, around 4 meters above Earth level, 3 meters away from the buildingRecording device: wav portable recorderAdditional equipment: RF-Systems AA-1 antenna adaptor for portable receivers