The 91919 Dipole Antenna is used to extend the transmission coverage of the 91901 or 91902 Page Transmitters, which is a hardware upgrade to the PALS® system that allows immediate alarm notification to security or emergency care personnel via pagers. Combined with at least one 90149 Motorola Advisor Gold Pager the PALS® systems, help can be summoned with just a push of a button. For maximum performance, the Antenna is placed at the center of the coverage area.