630 kHz has long been blocked by the powerful transmitter of our own domestic public broadaster NRK. This 100 kilowatt transmitter was closed down on June 30, 2011 and the antenna was blowned up some months later (September 8, 2011). There is a very interesting movie about the history of the Vigra transmitter and about the demolition of the mediumwave antenna on the web pages of NRK, by the way.
We haven’t had much luck chasing Transatlantic signals on 630 kHz untill our most recent trip to Lista. In January 2014 CFCO in Chatham-Kent, Ontario, was heard with a pretty good signal on the last morning of the DX-pedition. Country music with several “Country 92.9” jingles were noted. David Palmer, Program Director, promptly confirmed my report with a short but friendly e-mail. CFCO broadcasts with a night time power of 6 kilowatts simulcasting with their 92.9 FM transmitter