'Actually, I think that Ampegnon (sp?) antenna is not too uncommon, and there are still a few 500 kW transmitters using them kicking around. France's Issoudun facility comes to mind. They have an entire array of the things. They're even visible on Google Street View: https://goo.gl/maps/3xHLPrYyV46wPHRY7
Nauen Germany has one or two, also. WBCQ's is the only one in North America.
There's another big facility that has a couple, but I'm drawing a blank as to who it is. Either the Cerrik site in Albania or possibly Radio Taiwan outside of Taipei.
I think it's Cerrik. I've never heard of Radio Yaiwan International having any super big super special site.