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Babice Radio Station Culture Park Association


Grimeton Sister Station in the Stratosphere

An Experiment Needs Your Help


A balloon experiment, launched by Warsaw University of Technology, is planned to lift off on September 12th 2020, carrying a unique VLF 210-m-long fully-airborne antenna system, creating EM field on 14.2 kHz – the former frequency of the Babice Radio Station in Poland.


The project is delivering very important data for a doctoral dissertation. Any feedback on the reception of the signal (reception location, SNR, bandwidth etc.) is extremely important; your help in listening to the transmission would be invaluable!


The details on the flight & transmission are as follows:

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  • 12.09.2020: estimated lift-off time: 13.00-14.00 CEST
  • Lift-off location: Przasnysz Airport, Poland (53°00'46.3"N 20°55'52.4"E)
  • Flight duration: ca. 3 hours
  • Max. altitude: 30 km ASL
  • Emission type: A1 (narrow-band carrier) @ 14.2 kHz (1st class mobile EM device)
  • Operation starts on the ground, the antenna rises with the balloon ascending
  • More radio navigation signals: 144.8 MHz (seen on under callsign SP5AXL), 868MHz
  • VLF antenna type: centre-fed half-folded vertical electric dipole with capacitive sphere and vertical axial coil.


If you have any questions, the Babice Radio Station Culture Park Association ( - the patron of the experiment - can answer via e-mail or Facebook.


Please note that this is not an activity arranged by the World Heritage Grimeton Radio Station, nor by the Swedish Alexander Association. Any questions about this activity can be directed to the Babice Radio Station Culture Park Association.


[email protected]

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