Mercedes-Benz GLB Owner's Manual page 552

When operating two-way radios in the
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vehicle, always connect them to the
low-reflection exterior aerial.
* NOTE Invalidation of the operating per‐
mit due to failure to comply with the
instructions for installation and use
The operating permit may be invalidated if
the instructions for installation and use of
two-way radios are not observed.
Only use approved frequency bands.
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Observe the maximum permissible out‐
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put power in these frequency bands.
Only use approved aerial positions.
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1
Front roof area
2 Rear roof area
3 Rear wings
On vehicles with a panoramic sliding sunroof, fit‐
ting an aerial to the front or rear roof area is not
permitted.
Technical data 549
On the rear wings, it is recommended that you
fit the aerial on the side of the vehicle closest to
the centre of the road.
Use Technical Specification ISO/TS 21609 (Road
Vehicles – "EMCs for installation of aftermarket
radio frequency transmitting equipment") when
retrofitting two-way radios. Comply with the
legal requirements for detachable parts.
If your vehicle has fittings for two-way radio
equipment, use the power supply and aerial con‐
nectors provided in the pre-installation. Be sure
to observe the manufacturer's supplements
when fitting.
Two-way radio transmission output
The maximum transmission output (PEAK) at the
base of the aerial must not exceed the values in
the following table.