The CELL-ANTSMA is useful for adding 10ft of distance from your LTE Vista or Lynx Touch communicator to a better point of reception. This can be either inside of the home or outside of the home. The 10ft is not adjustable. It is compatible with the LTE-XA, LTE-XV, LTE-57A, LTE-57V, and the IGSMV4G. It comes with all accessories needed to mount the unit.