Abstract: A unitary broadband high impedance isolation section for a plurality of cely spaced antennas as well as other electrical apparatus wherein the respective separate coaxial cables feeding the antennas and the shielded multi conductor cable for the other electrical apparatus are wound in the same direction on a common core and have the same number of turns, with the shields or outer conductors of all the cables being respectively connected together at the beginning and the end of the windings. The multiport cable choke thus configured can be provided with respective connectors at each end of the choke for facilitating ease of installation into the electrical system, that is, a single multiport cable choke can be inserted in the feed lines of multiple antennas and other electrical equipment simply by means of making suitable interconnections by way of the connectors on both sides of the multiport cable choke assembly.

Abstract: A phase front homing system airborne antenna array which employs portions the airframe as two antenna elements and wherein each antenna element includes a coaxial sleeve coupler.

Abstract: A center-fed VHF dipole antenna structure particularly adapted for 30-80MHz peration wherein one half of the radiating structure comprises the outer conductor of a coaxial feedline which includes a low-loss cable choke at the lower end of the half dipole length of the feedline while the other half of the dipole consists of a conventional radiating conductor element. Additionally, remotely controlled variable impedance elements are included at the feedpoint to provide selective coarse and fine tuning of antenna resonance.