The SXTsq 5 ac retains a 16 dBi antenna like the SXT 5 ac, our previous model, yet the antenna design has been improved and the physical size has been dramatically reduced - the SXTsq is two times thinner. - SXTsq 5 ac-US (USA) is factory locked for 5170-5250MHz and 5725-5835MHz frequencies. This lock can not be removed. - SXTsq 5 ac (International) supports 5150MHz-5875MHz range (Specific frequency range can be limited by country regulations).