The antenna for 40 m is a dipole inside two 12 m fiberglass poles from Spiderbeam. The outermost section is not used. It is mounted just below the tribander at about 21m.
The 40 m dipole has been shown to have a negative impact on the FB 53 when oriented parallel to its radiator. It is therefore currently oriented along the boom of the tribander.
See the post about the influence between different antennas.