The Hy-Gain Model 2BDQ-S is a 1/2 wavelength, dipole antenna for 40 and 80 meters. Band switching is accomplished automatically through the use of two matched Hy-Gain 40-meter Hy-Q traps. The maximum overall length is 100' 10 1/2". If the antenna is mounted in an inverted "V" configuration, the overall length will be shortened. The balun will improve the performance and efficiency of the 2BDQ-S. The Hv-Gain Model BN-86 is a broadband balun designed specifically for dipole-type antennas. The balun balances the input impedance to the antenna and prevents transmission line radiation.