====== Tropospheric Ducting ======
  * [[http://aprs.mennolink.org/|APRS Propagation Map]]
  * [[http://www.dxinfocentre.com/tropo_wam.html|Tropospheric Ducting Forecast - West Coast]]
  * [[http://www.dxinfocentre.com/tropo.html|Tropospheric Ducting Forecast - East Coast]]