What is the cause? In short a low signal.
Pretty simple yet we often struggle with identifying the fault causing low signal. Failure to identify the real fault or multiple faults means you could be trying to fix something that is working and failing to pay attention to the real fault.
Sometimes the fault is very clear and obvious like this one
Sometimes the fault is less obvious and the detail can be hidden.
We use some of the most expensive test equipment available for testing signal, cable, connections, antenna and identifying noise and interference.
If it works, it works. If it doesn’t, do you want it to work? and work reliably?