2 way FM-DX
The BEST "FM Ducting" I had was way back in the early to mid 1980's...I was eating lunch in in my car near Novato, CA (Marin County) and had my trusty Bearcat 250 with me plus a Radio Snack mag mount scanner antenna on the roof of my car, and I was listening to the Marin County CHP dispatch on Silver Base - 42.08 Mhz, and if I remember correctly the PL is 138.4...
All of a sudden some FM interferrence started and then I was listening to a female southern accent asking her units to "Please repeat because of skip from California"...
And then the local CHP Dispatcher said she was getting skip "from someplace else"...
I extended my lunchbreak until I got both call signs...
I hated to turn the scanner off and return to work, but as a wage slave I had no choice...but that day will always be rememebred in my feeble brain as the best coast to coast "FM Ducting" on a VERY hot day...
I called up a friend at the San Francisco FCC office and run the callsigns (there was NO internet back then where you could do a database search)...
That "Southern female voice" was that of the Florida Highway Patrol swapping VHF-LO skip on that very hot August day with the California Highway Patrol...
And that VERY HOT day was much like TODAY (so keep your radio on and a log book nearby) it's 103*f here...