A thought on the Mining WSPR transmissions

http://wsprnet.org/drupal/wsprnet/spots

Click on "Specify query parameters" and specify your callsign or callsign of a particular spotting station.

Copy the screen data to a text file then import the data into MS Excel (or equiv.) and plot like shown further on down on this webpage:

http://www.qsl.net/wb5wpa/EHantenna/EH_Mark_2_Vert/