I still remember in 2007, Hornell, NY's, 1320AM WHHO, tried a return-to-the-air for about a year. Instead of rebuilding the tower, they ran a longwire, which worked, but didn't have the coverage that they did originally. KQV in Pittsburgh came back, at 1410AM, but more, or less, as a glorified radio 'working' museum.
https://www.radio-locator.com/cgi-bin/finder?call=KQV&band=&country=&scope=&count=20&sort=Call&sr=1&s=C&sid= TIS Stations have been both, switched on and off, over the years, lately. And, the idea of expanding Low Powered radio to AM, for a licensed LPAM, already has, and continued, to get squashed by the NAB. Looks like Part 15'ers are the real AM expanders to take to the air, mainly with the 10ft Antenna and MAX power of 100 milliwatts peak. (Albeit, many Carrier-Current Stations have been taken off air. I know of only five that continue to exist.) Anyway, still interesting STATS to examine from Chris's preceding post.