The antenna-footprint shows DRC-errors for clearance violation.
The simplest solution is to just ignore this DRC-error, the pcb-designer knows that this DRC-antenna will deliberately short the antenna connection points.
The more advanced solution is to correct the footprint and use the “net tie” feature in the footprint definition.
differences (== corrected mistakes) to the original antenna footprint:
there was one THT-pad completely without pad-number → renamed to PAD== “1”
in the footprint properties → Clearance overrides and settings → set the netties to “1,2”
remaining problem: the bottom copper line must later be routed as additional extra copper track
@Vincent : to overcome your “new user” status and get the “basic user” level (so you are able to attach example projects): read and follow this link: New Member Information