There are three key considerations to keep in mind to install a GPS antenna.
The first and most important is that a GPS antenna does not have the ability to receive signal through metal. It is for this reason that the closer the glass if installing within the car interiors better reception.
Secondly it should be noted that the GPS antenna for automotive devices typically have two surfaces and only one of which receives GPS signals.
This area also has a pickup angle limited GPS signal in about 160 °. This angle should cover as much open sky for optimal performance.
Thirdly, and this not least, if you plan to install the device and the GPS antenna on the dash note that electrical interference will be caused mainly by:
- Moon or defroster rear window electric cable.
- Tinted windshield glass or solar reflection.
- Tinted windshield glass or metal compounds.
- Glass or windshield radio antenna wire.
Also, we always recommend that the GPS antenna is installed not less than 5 inches from the metal obstruction or radio source.