Hi Mike.
23.75 inches, not including the threaded base.
I have seen two types over the years. The most common is a thin walled drawn steel tube that is copper plated. A threaded steel plug is pressed into the bottom and a wooden dowel pressed into the top.
The second version is solid steel rod with a Parkerized finish. Machined threads added to the base. Slightly rounded top end.
Both are the same diameter.
My thought is the solid rod is a late war development to reduce the number of broken B-Set aerials.
Hope this helps.
David
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