Based on the analysis provided by the experts above, my understanding is:
Beijing A-class small radio stations operate in Beijing, with a nationwide coverage range. The station addresses are only provided for regulatory purposes and do not hinder mobile operations.
Beijing B-class shortwave radio station broadcasts in Beijing, with a coverage range of nationwide and international. The station's address is only for regulatory purposes and does not interfere with mobile communication.
Small radio stations in Beijing (A/B class) have emerged in Beijing: Coverage range is constrained by the transmitting location (meaning each location has different explanations), and station addresses are only for regulatory purposes, without hindering mobile communication.
Ministry of Industry and Information Technology (MIIT) regulations: Whatever is written in the scope of communication, it must be adhered to. Specific addresses cannot be changed; if within XX province, it must remain there; if nationwide, it must cover the entire country.