I don't really know these things, but the probe used appears to be a coil
with <=2 mm diameter:
https://www.langer-emv.de/en/product/rf-passive-30-mhz-up-to-3-ghz/35/rf-r-0-3-3-h-field-probe-mini-30-mhz-up-to-3-ghz/18
. Not sure why they use an H-field probe; I would have expected E-field.
Tom's Hardware: Raspberry Pi Detects Malware Using Electromagnetic Waves.
https://www.tomshardware.com/news/raspberry-pi-detects-malware-with-em-waves
"A team of researchers from the Research Institute of Computer Science and
Random Systems (IRISA) has developed a malware detection system
