If compression occurs, the amplifier may also generate other unwelcome signals. If these undesired signals are in a high adequate degree, they are going to once more de-sensitise The bottom station. So a badly made repeater will amplify your mobile phone signals, but may also generate compression goods. Single booster https://www.digitaljournal.com/pr/news/marketers-media/mobile-phone-signal-boosters-ofcom-approved-commercial-mobile-booster-installer-enhances-indoor-coverage