The Engineers who created the Wilson Trucker C.B. Antenna have designed a cellular antenna that connects directly to your cell phone with an external antenna adapter.   No  other manufacturers cellular antenna comes close to the performance of the Wilson Trucker Cellular Antenna, both
 on 800 and 1900 MHz (Digital or Analog)
 Up to 90% of cell phone signal on both transmit and receive is absorbed within the vehicle body and the user's head. Wilson solves this problem by channeling all the power   from the cellphone to the outside antenna. This results in the Wilson Cellular Trucker Antenna transmitting and receiving over 10 times more signal (10-15 db Gain) than a  cellphone used inside the vehicle without an outside antenna.