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Most products sold as "TV masts" are not just ordinary pipes. In many cases, they already have one end of the pipe tapered so that they can inserted into the end of another section of mast. They also have notches or set screws that prevent the different mast sections from rotating relative to each other.
In other words, they are designed to stack end-to-end without rotating.
You can probably find TV masts at your local Radio Shack, Home Depot, or Lowe's if you want to see how they're built.
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