The ETS-Lindgren Model 3104C Biconical Antenna is designed operate over the 20 to 200 MHz frequency range to meet Military and DOD EMI specifications. It is of lightweight construction for ease in handling and storage. The biconical elements are made from welded aluminum. The elements mount in a balun network which is fabricated of phenolic and is equipped with the necessary impedance-matching components. The Model 3104C is designed and precisely manufactured conform to the requirements of MIL-STD-461 and other Military Standards as reflected in Drawing ES-F-201286. Each antenna individually calibrated during the manufacturing process. The results of these calibrations are tabulated and included with the antenna as gain and antenna factor vs. frequency data for use specification compliance testing.