A frequency search for 700 kHz shows some high power night time licenses in AB and NB. I don't remember if those licenses existed before the downgrade the Clear Channel concept, which I think happened sometime in the 70s or early 80s.
Here is a link to a map showing all AM stations on 700 kHz, as of now.
Color code: Red = Unlimited Green = Daytime Black = Nighttime http://s20.postimg.org/z43hz28h9/700_k_Hz_Stns.gifRF
_________________ Topband Reflector
