/usr/share/librecad/library/elektro/antenna/ is in librecad-data 2.1.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/librecad/library/elektro/antenna-iso/Aerial-dipole.dxf
/usr/share/librecad/library/elektro/antenna-iso/Aerial-loop.dxf
/usr/share/librecad/library/elektro/antenna-iso/Aerial.dxf
/usr/share/librecad/library/elektro/antenna/ant1.dxf
/usr/share/librecad/library/elektro/antenna/ant10.dxf
/usr/share/librecad/library/elektro/antenna/ant11.dxf
/usr/share/librecad/library/elektro/antenna/ant12.dxf
/usr/share/librecad/library/elektro/antenna/ant13.dxf
/usr/share/librecad/library/elektro/antenna/ant14.dxf
/usr/share/librecad/library/elektro/antenna/ant15.dxf
/usr/share/librecad/library/elektro/antenna/ant16.dxf
/usr/share/librecad/library/elektro/antenna/ant17.dxf
/usr/share/librecad/library/elektro/antenna/ant18.dxf
/usr/share/librecad/library/elektro/antenna/ant19.dxf
/usr/share/librecad/library/elektro/antenna/ant2.dxf
/usr/share/librecad/library/elektro/antenna/ant3.dxf
/usr/share/librecad/library/elektro/antenna/ant4.dxf
/usr/share/librecad/library/elektro/antenna/ant5.dxf
/usr/share/librecad/library/elektro/antenna/ant6.dxf
/usr/share/librecad/library/elektro/antenna/ant7.dxf
/usr/share/librecad/library/elektro/antenna/ant8.dxf
/usr/share/librecad/library/elektro/antenna/ant9.dxf