Screw hole (2.5mm hole 7.5mm from below/42.5mm from right resp.
2mm from notch's upper edge/6.5mm from notch's left edge)
Drill pilot hole 2mm from notch's upper edge/6.5mm from notch's left edge (afterwards enlarge hole to 2.5mm)
Countersink 2.5mm hole
Antenna pilot hole
Enlarge hole in several steps to 7.5mm
Carefully enlarge hole slightly with taper reamer
Antenna mounting with grommet
Antenna mounting inside