While playing with antennas today, I ran across two of the old fashioned "Numbers Stations" on the MW / AM bands.... specifically on 635khz, at ~11:45 CDT, and on 730khz, at 12:02 pm CDT. Both transmissions were similar, with a Spanish language femail voice reading a string of four digit numbers for about 4 minutes, then shifting to a four digit number followed by a 5 second tone that sounds like an old fax machine. After about ten minutes, they faded away. These sort of transmissions were common when I first got into radio, but I thought they had gone away a long time ago. I guess not! My guess is that they are coming from Cuba, especially since I also heard "Radio 26" on 1060khz from Matanzas. It's been quite a while since I've heard any Cuban stations on MW.... I guess there's an opening at the moment. Propagation never ceases to amaze me.