6 Pack Cell Phone and PDA Antenna Booster Works on Mobile Phones Works on PDA Increase Reception 6 pack on antenna boosters You should notice atleast ONE &quot;bar&quot; more than before. Keep in mind that in a near zero signal strength area (less than continuous single antenna strength bar), results will be minimal. In areas where cell signals are non-existent, the booster will have no effect (but neither would a 10 foot antenna)