Cellular Signal Amplifiers (sometimes referred to as cellular signal "boosters" or Bi-Directional Amplifiers) are designed to enhance a cellular signal received in areas where signal strength is affected by terrain, buildings or other obstacles.  They are compatible with normal cellular network operations, and boost cellular signal strength along the edge of the network cell.  They are linked to the exterior cellular antenna via coaxial cable and are cabled directly to the antenna of the cellular equipment by means of an adaptor cable (direct-connect).

Most quality cellular amplifiers are "dual-band" these days...meaning that, as cellular networks have expanded their frequency assignments, the system will amplify both the lower (Cellular) band (800/850 MHz) and the upper  (PCS) band (1900 MHz).

Cellular Signal Repeaters are a special type of cellular amplifier.  They are linked to an exterior cellular antenna and to an interior cellular antenna via coaxial cable.  Cellular repeaters are designed to "resend" the received (and amplified) signal throughout a coverage area by means of the interior cellular antenna.  This allows the signal to be received by multiple cellular units simultaneously and (totally) wirelessly (no direct connection to the handset). 

All cellular signal repeaters provided by OmniCell Communications are high quality units capable of enhancing your cellular signal under difficult circumstances.  Many cellular repeaters offer only a single-band process.  You must choose between the 800/850 MHz band and the 1900 MHz band.  Equipment must be purchased and installed for the specific band that is in use for your carrier.  Digital Antenna offers all of their signal repeater systems as dual-band units.  Wilson Electronics offers both single-band units and dual-band units.