Hello All,
I stumbled across a great website:
http://www.dxtuners.com/servlet/IBMainServlet/?ib_page=1&iw_language=enThe above URL has online receivers listed all over the world. I've tried it myself and it seems to work very well. I Heard AM QSO's on 7290 and 3885 from a rx site in London, Ontario.
Once you register with the site and follow protocol, you'll gain access to all of it's facilities. Just like attempting to call CQ on a seemingly vacant frequency, it asks to to inquire if anyone is using the receiver at the particular site you're on. If not, it's yours to take control of.