The flagship station of the CBS Radio Network, WCBS New York NY on 880 kHz, can get through quite well during good propagation conditions from the U.S.
The station made it through to Pinelands at 0450 UTC on the 22nd August 1976 via the Siera valve receiver and 20 metre longwire antenna.
I was fortunate to receive a QSL card from WCBS, signed by C. Adams, in response to my reception report.
HISTORICAL PERSPECIVE FROM 1978
Click here for a well documented and fascinating account from the http://www.nyradionews.com/ website featuring a behind-the-scenes historical profile of WCBS from 1978.