Raymond:
Yes, there a many LF stations operating all over the US. They are used with a receiver in aircraft called the "Automatic Dircection Finder", or ADF. These radios also cover the broadcast band, and are very useful (before LORAN and GPS) for finding airports that do not have more elaborate navagation systems, just a local radio station. The one at the Covington, GA. airport is at 370kHz and can be picked up in the plane no farther than 5-10 miles away. They go from just giving an ID in Morse code to complete weather information. They do not cover the nation like the old range system did, as they are only around 5 or 10 Watts output.
Lewis
: