41-616 SW antenna needed

[mat68046]

Hello all
Back with a new twist to the "beast" rehab. Apparently the shortwave antenna is missing from this set, among other things. Thanks to Al Corbin the chassis is mostly functional including the Mystery remote. However in trying to assess SW functionality he asked me for antenna loop dimensions to replicate a test antenna. I cannot find one in the cabinet.
Any help getting spec's for this antenna would be greatly appreciated...!
I assume that similar models would use the same antenna so maybe that's an alternative source of information.

Thanks