OK I've always checked 96.3 to be sure its Blank and 95% of the time it is. However Yesterday I was off the air around 6PM on FM. I desided to scan and see what DX conditions I was gonna get because there was a huge temperature inversion. I picked a station 152 miles away on FM on 96.3 in Jacksonville, NC. So the moral of this story is if you know the temperature is gonna invert you may want to go off the air once say hr or hr 1/2 to be sure your frequency is still not occupied. Remembe it is possible for your transmitter to transmit further during a temperature inversion so if you have a station comming in on your frequency you could get a NOUO for jamming a used frequency. Plus its just a good way to play nice on FM to do this practice when you know there is gonna be a temperature inversion or Rain as this too will cause distant stations to come in.
I hope this helps all part 15 FM Broadcasters.
Best Regards.