"Replanting" a clothes line

Last summer, I made a concrete base around a clothesline pole to put it in the ground. On the advice of Hometalkers and others, I made the bottom of the base wider than the top to prevent the frozen soil from heaving it out of the ground. It didn't work. During the winter, the base cracked and the narrower core was pushed loose. I hope this description makes sense, but basically I am trying to figure out what to do now to get it in the ground and keep it there.
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