A few specific things to try and see how you are doing...
2.5, 5, 10, 15, 20 Mhz. That's WWV out of Colorado, you should be able to pick up one of them at most any time, that should tell you around where to look. »
www.nist.gov/physlab/div ··· /wwv.cfmArmed Forces Radio... always Upper Side Band, they come in out of Key West, you should be able to get them in Florida pretty well. »
myafn.dodmedia.osd.mil/S ··· ave.aspxAs was said above, Australia and Germany have two pretty broad networks of transmitters. I've confirmed Austraiia and Africa on nothing more than a 50' long wire for an antenna. Radio Havana is always loud here in Atlanta.
Good luck!