The performance of a Cel-Fi is primarily determined by two criteria. First, try and place the Network(Window) Unit where it gets the most bars. Second, the Network(Window) and Coverage Unit should be far enough apart so the coverage indicator for the Coverage Unit is as high as you can get it, even if it means putting the Coverage Unit on the opposite side of the house or office. If the “too far” red lamp comes on, move the units closer together.
See your Quick Start Guide for more information, or watch an installation video at www.cel-fi.com
Please also see the article: "Trick to increase Coverage Unit coverage number."