The GPS tracker will only work well if you follow certain rules:
1) Metal is not your friend
The tracker (like any other electronic system) is sensitive to metal and magnets, which can prevent it from communicating properly. It is therefore important to avoid placing it in an all-metal compartment at the risk of creating a so-called Faraday cage.
On a bike:
For this reason: if you are using your Tracker to protect a bike, it is strongly recommended not to place the tracker in the bike frame, handlebars or seat tube unless your bike is made entirely of carbon fibre. The most reliable option is under the saddle if you can, so place it in a plastic bag or plug the connector to prevent any infiltration. You can also slip it into a piece of bicycle equipment such as a saddlebag.
You can also try to place the tracker inside the plastic cover for your bike's engine.