So, is the USA an antipode of China? Nope. Not at all.
Using this little antipodal toy, I found out that from my home in Texas, if I could dig straight through the earth, I would wind up somewhere in the Indian Ocean. [The top map is the original location and the bottom map is its antipodal point.]
And, if I were to dig all the way through the earth in a straight line from my home here in Taiwan . . . I would wind up in Paraguay. [And, no, Taiwan is not the same size as South America--the map scale on the left is different.]
So . . . I might not be EXACTLY 1/2 way around the world via the earth's core at least, but I sure am close.
And, Tiffany, one of my cousins who came to visit at the end of July, had just left Argentina after being there a year. For the year that she was there . . . we lived almost exactly on the other side of the world from each other! Cool!