Interesting article. While I've heard of the graveyard stations before, the point that "the six most crowded frequencies in the AM radio band: 1230, 1240, 1340, 1400, 1450 and 1490 kHz" had never really hit me until reading in this article.
Also interesting in the article is that 1490 WVBG(AM) in Vicksburg, Miss., that typically at night has coverage radius of 10 miles was picked up "In September, the signal was captured remarkably clearly in the Lapland region of Finland, approximately 4,700 miles away by accomplished medium-wave DX’er Jim Solatie. .... with an antenna wire over 3,000 feet long in length, pointed toward the U.S. East Coast. It is one of 14 antennas available at Aihkiniemi, described as the ultimate AM DXing base in Lapland." Those said antennas aren't for sale but for rent. https://www.dxing.info/dxpeditions/aihkiniemi.html
And the picture of that DX station:
brings up another topic because it looks similar to this picture just posted at Part15Broadcasters on Facebook by Glenn Lary with the comment on how his Rangemaster is benefited by the reflective power of the grounds.
To which someone curiously named "Christopher AI" replied with this comment:
"An Earth ground that is well-saturated by rain or snow makes for an excellent ground plane. And if ground conductivity in a given area, all the better and it's all legal coverage! I remember last year right after Hurricane Milton cause such storm surge that thoroughly saturated the ground in my town, the coverage of my little station doubled. This was beneficial as we do alot of news and information, stuff people search the radio dial for when they need to know, especially in severe weather and in the aftermath of such."
I wonder if that DX Base in Lapland could pick up one of our Part 15 stations!