SIGNAL IDENTIFICATION GUIDE (SigIDWiki.com)
Numbers & Oddities ( "The Spooks Newsletter"): lumea fascinanta a "Number Stations" si a altor semnale ciudate din spectrul HF
Short-Wave.info (baza de date globala cu statii de radiodifuziune si orar de lucru)
https://priyom.org/ (baza de date semnale speciale )
PilotNav ( baza de date balize aero )
Posturi radio FM online din Romania
Radio Garden (planiglob rotativ 3D cu posturi de radio online)
Trasare azimuturi si rute: https://osmcompass.com/ https://setcompass.com/DrawRoute.htm
LZW Varna (Bulgaria) maritime coastal radio schedule (you can listen it on our online SDR's)
M.F. Coastal & Maritime Stations 305 kHz to 4000 kHz ( www.coastalradio.org.uk )