Unfortunately between nabbing it and getting it home, the
cardboard tag broke off and disappeared, but ISTR that
it said type 411

AIUI, this is a throw-away antenna that was chucked out the back of an
aircraft to give HF coverage in flight.
It has a spring clip at one end, and a fastening at the other.

It is a 5" dia coil of what looks like Litzendraht (sp?) , estimated 100
turns,
and is tacked up by string in the manner that was used by lacing cord.

It is unused.

Anybody out there with the gen on it, please?