ETS-Lindgren's Model 3150B Dual Stacked LPDA is a dual stacked log periodic dipole array antenna (LPDA), with each of the two LPDAs being 100 antennas. When assembled in parallel, the result is a 50 input impedance array. This array provides increased gain when compared to a single LPDA. Low VSWR provides an excellent match with the amplifier, resulting in a high field generated related to input power. This antenna is suitable for situations where high fields need to be generated, such as military and in automotive EMC applications.