Several weeks ago it was asked in this forum if there were any remaining TV stations operating in the US after the DTV changeover. True there are few if any of significance remaining using analog TV now, however there are a great number that converted to DTV channel 2 stations that are operating in the US at a variety of power levels and locations including the border regions of Canada and Mexico.
By monitoring the DTV 2 pilot carriers at 54.309 MHz, has been a valuable source of continuous signals available in my areas of the US that will provide good indication of meteor, sporadic E and tropospheric enhanced propagation. This refers only to DTV channel 2, however any of the lower channels 2-6 are worth listening for the pilot carriers using the same offset (309 KHz) above the lower edge of the channel frequency.
Almost live meteor, sporadic E returns including orbiting space craft returns can be observed on a variety of other frequencies that are in use at my location in Iowa and also from New Mexico receivers at http://www.roswellmeteor.com/default.htm
For a listing of the most recent DTV 2 channel station list from the FCC, go to http://transition.fcc.gov/fcc-bin/tvq?state=&call=&arn=&city=&chan=02&cha2=02&serv=&type=0&facid=&list=1&dist=&dlat2=&mlat2=&slat2=&dlon2=&mlon2=&slon2=&size=9
Denny - K0LGI