After receiving the report, Shaoyang Wireless Office immediately organized personnel to conduct special monitoring. At 9:00 a.m. on April 13, the staff finally discovered the suspected "black broadcast" signal during repeated patrol monitoring, using a frequency of 90.6MHz.

The content of the signal is demodulated and monitored, and the station database is compared to further confirm that it is indeed an illegal signal. The staff then used vehicle direction finding and portable positioning equipment to lock the "black broadcast" on the roof of the 33rd floor of You'a International Plaza, Shaoyang City. Law enforcement officers collected evidence on the spot and removed relevant illegal equipment.