The script shown below will catch the vias that were missed in Altium's DRC check.
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Antenna Vias are vias the do not have connections on more than one layer.
Tips:
Pour all polygons before running the script !
If you want to keep the vias then add a fill or connect a track on another layer. Or convert the via to a free thru-hole pad.
You can use the PCB List panel to investigate each selected via.
Click on image to view
Download Parts and Scripts Link: Download Parts