Start with the function: Reflection coefficient is the complex ratio of reflected voltage wave to incident voltage wave at a reference plane, containing both magnitude and phase.
What the label leaves out
Its magnitude relates to return loss and SWR; its angle helps locate and transform an impedance along a transmission line. The value changes with reference-plane position.
The mistake to avoid
Reading only SWR throws away phase information and can make two very different impedances look identical.
A sound installation approach
Calibrate at the plane of interest, preserve the complex measurement, examine magnitude and phase or a Smith chart, and include adapters and feed line deliberately rather than accidentally.
System boundary
Use current manufacturer documentation, measured RF behavior, the building grounding system, and applicable electrical and lightning requirements. A ratio, DC continuity check, or inline protective device does not establish complete-system safety or efficiency.
