Configuring a cellular telecommunications network base station repeater for use at a particular location includes performing data collection activity at the location to obtain an indication of the transmit frequency of a nearby base station of the cellular telecommunications network. The repeater is then set to amplify received signals at that frequency. By only amplifying this particular frequency, the repeater can provide cellular telecommunications coverage at a location (for example a basement) where coverage might not otherwise be available by amplifying only the relevant frequency. This is in contrast to amplifying indiscriminately a wide range of frequencies, which can interfere with other radio transmissions.