I remember about 10 years ago, a station on 6250 or so would appear, rebroadcasting a local FM station. I heard them once around sunset for about 20 minutes before fading out. The FCC tracked the guy down. He was using 6250 to transmit the FM station from his house to his work shed in the back yard, or something similar. Not sure of the wattage but it was low.
I'm wondering if this could be something similar?