It was generated by Google Maps and was included on the (any station) KVOS page on the REC Broadcast Inquiry website. I don't have the software to capture Google map images, so I shot my screen with my camera! On a post here, I mentioned the G map field strength images were discontinued a few months ago, but someone must have been listening because they were back this morning, but now they are gone again! Beats me why. You can check any station at: REC Broadcast Query
I'll look to see if I still have that image: I had a hard drive crash two months back and it may not have been backed-up. I'll advise.
Jim : )