Electronic reconnaissance systems consisting of antennas, computers, direction finding receivers, radio frequency distribution and electric switches, signal processors, radio jamming transmitters, and computer software to operate and control electronic reconnaissance systems; antennas, and structural and electrical components, parts and accessories therefore, namely, electric switches, diplexers, transmission lines and cables, baluns, matching units and electrical controllers; and broadcast antennas for digital television, ultrahigh frequency, and very high frequency, frequency modulation broadcast and reception antennas; power switches; diplexers; communication transmission lines; waveguides; and cable pressurization units consisting of electronic meters, air dryers, compressors, central office manifolds, and pipe feed panels, all sold as a unit