VIETA CDV7500GP Owner's Manual page 6

Installing the GPS Antenna / Aerial
Parts Supplied
Setting
When installing the aerial inside the vehicle (on the rear shelf)
Affix the metal sheet on as level a surface as possible where the
GPS antenna / aerial faces the window. Place the GPS antenna /
aerial on the metal sheet. (The GPS antenna / aerial is fastened
with its magnet.)
Description
GPS aerial
Metal sheet
Clamp (5 pcs.)
Waterproof pad
GPS anteanna / aerial
BR - 6
Metal Sheet
Peel off the protective sheet
on the rear.
Make sure the surface is
free of moisture, dust,
grime, oil, etc., before
affixing the metal sheet.
Note:
The metal sheet
contains a strong adhesive
which may leave a mark on
the surface if it is removed.
Clamps
Use clamps to secure the
lead where necessary inside
the vehicle.