Not in HO scale, Carol. To convert a real-world dimension to HO scale, simply divide by 87. So . . .Thanks Bob, I'll take a look. I think, if as Lynn said a pole is 12" in diameter, then that will be about 1/16th of an inch scaled (approx) I think if my math is any good.
12"/87 = 0.137" (to the nearest 1/1000")
Therefore, in HO scale, you could use 1/8" (0.125") tubing to represent a 12" pole. The 1/8" tubing would be slightly undersized, but I doubt if anyone will notice! If you can find some 9/64" (0.140") tubing, that would be more accurate.