Shortwave/HF Utility Radio

Shortwave Radio:

http://www.worldofradio.com/index.html

https://wiki.radioreference.com/index.php/SWL_Broadcast

http://mt-shortwave.blogspot.com/

http://www.hard-core-dx.com/

https://short-wave.info/

https://swling.com/

https://shortwaveschedule.com/?now=true

http://hfradio.org/english/

https://www.shortwaveradio.be/

http://www.dxfanzine.com/

https://shortwavedx.blogspot.com/

http://rx.linkfanel.net/ (worldwide SDR receivers online)

http://kiwisdr.com/public/

http://websdr.org/

https://www.hard-core-dx.com/index.php?topic=Logs

https://shortwavedx.blogspot.com/

https://www.shortwave.be/

https://www.naswa.net/

https://www.radioreference.com/

https://wiki.radioreference.com/index.php/SWL_Broadcast

https://www.dxinfo.se/

https://www.swld.com.au/default.htm

https://www.bdxc.org.uk/

https://www.bdxc.org.uk/links.html

https://www.wwdxc.de/

https://wiki.radioreference.com/index.php/Utility_Monitoring

https://wiki.radioreference.com/index.php/RadioReference_UDXF_Portal

VLF/LF/NDB:

http://www.vlf.it/

https://rxx.classaxe.com/en/rna/signals

https://www.dxinfocentre.com/ndb.htm

https://www.ndblist.info/datamodes.htm

https://www.ok1in.cz/downloads/ndb%20beacons.pdf

https://www.ka7oei.com/spec_ndb1.html

https://www.ndblist.info/ndbphotos/pics/andypics/ndbhunting.pdf

https://en.wikipedia.org/wiki/NAVTEX#:~:text=NAVTEX%20broadcasts%20are%20primarily%20made,for%20broadcasts%20in%20local%20languages.