British DX Club – UK
Canadian Radio Directory – by Andy Reid CAN
DXing.info – by Mika Mäkeläinen FIN
DX-Signal Bulletin – by Dmitri Mezin RUS
DXways-br – by Rudolf Grimm B
Interval Signals Online – by David Kernick UK
MWLIST – by Günther Lorenz D
PK’s Loop Antennas – by Paul Karlstrand AUS
Radio Heritage Foundation – by David Ricquish NZ
Radio-Locator – USA
UK Broadcast Transmission – by Christopher Partridge UK