JEM Engineering specializes in the development of custom antennas for government, military and commercial applications. Our ISO-Certified and award-winning organization is proud of the ability to offer customers rapid in-house customization from concept to product. JEM also offers top quality RF testing services for both passive and active devices with the use of our Spherical Near to Far-Field Chamber and our Tapered Chamber covering frequency ranges from 80MHz- 40GHz and CDMA, WCDMA & GSM active bands.