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 )