Sony HKDW-704 Operation Manual page 89

1
To attach the antenna inside a vehicle
The antenna is equipped with a built-in magnet. Attach it vertically in a
location where GPS radio waves can be received without obstruction,
such as on a dashboard
When sensitivity is not sufficient It is recommended to put some sort of
metal plate of about 6-cm square under the antenna.
To attach the antenna outside a vehicle
Attach the antenna vertically in a place or onto an object where there are
no obstacles surrounding it.
1-9
Chapter 1 Using GPS Data