The 3971D-DH-W Permanent Mount GPS Antenna provides 28 dBd of gain and has one of the industry’s lowest noise ? gures. It provides clear GPS signal reception while minimizing loss-of-lock even in less than ideal conditions and is the optimum choice for GPS Tracking and Timing applications with long cable runs and stand alone GPS applications The 3971D-DH-W features a precision tuned custom ceramic patch element, ESD circuit protection and a high rejection SAW ? lter. Available in an all-plastic, non-corrosive white coneshaped radome for ? xed installations.