Not too long ago we posted about Jacek Lipkowski (SQ5BPF)'s project called "Etherify" which seeks to use unintentional RF radiation from Ethernet hardware/cables to transmit arbitrary signals such as morse code and FSK. During his earlier experiments he noted how he felt that the Raspberry Pi 4 had an unusually strong radiated Ethernet signal. In his recent post Jacek investigates this further.
Indeed his new tests seem to confirm that the Pi 4 has excessive RF leakage from the Ethernet hardware. His latest results have shown that he was able to receive the Ethernet leakage strongly from 50 meters away without any cable connected to the Ethernet port to act as a radiator. Jacek's post contains a number of demonstration videos such as the one below.
He admits that his particular Pi 4 unit might be unique in this regard. If anyone else tests this and can confirm excessive leakage, please let us know in the comments.