[Milsurplus] How to ship antenna ?

[Hue Miller]

As i downsize, i found an antenna that i will need to ship.
Folded down, it's about 5 ft long by 5-6 inches across.
What kind of tube can i get to mail this thing in? Suggestion?
This is a "Sterneantenna" capacity hat for MF operation of
a "Command Panzer" radio in the  1 - 3 MHz range. ( Forget
the NVIS fantasy. ) I realized that i should forget any idea 
about owning a Panzer, and this so this is just excess metal
to me. Interesting, maybe, in that it's real iron, and heavy,
naturally, as Germany had to spare its aluminum for aircraft.
-Hue Miller  K7HUE