Condor SIM800F Betriebs Und Installationsanleitung Seite 42

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 If the GSM modem has not been fitted at the factory, an 11 mm  hole for the FME/M
antenna cable must be drilled in a suitable place in the respective housing type, e.g. in the
housing top (Figs. 20 / 21).
Run the antenna cable inside the housing so that it does not come into
contact with live components. Also make sure that the cable cannot break or
become damaged when opening or closing the housing.
Fig. 20
Operating and installation manual for GSM mode
Fig. 21
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903 501 - V1.0