Most Linux distributions include a repository of known frequencies for worldwide locations. You can usually find these in: /usr/share/dvb/ /usr/share/dvb/dvb-t/ (Terrestrial) /usr/share/dvb/dvb-s/ (Satellite) /usr/share/dvb/atsc/ (North American Standard)
Inside that directory, files are organized by broadcast standard: (Terrestrial / Antenna) (Satellite) (North American Terrestrial) dvbv5scan initial file
Here's a basic example of what an initial file might look like: Most Linux distributions include a repository of known