CC1350STK: sub-1 GHz external antenna selection

Dear all,

As CC1350STK provides an external antenna interface, I am thinking about choose an external which will provide a better performance than PCB antenna. CC1350 works at sub-1 GHz, is that means that any antenna designed for 315- ,433- , 470- , 500- , 779- , 868- , 915- , 920- MHz can be chosen as an external antenna? Another question is that how CC1350 switch between these frequencies? Did it choose a working frequency depends on the user antenna?  

Thanks a lot