AD-55/E — UHF Dipole Antenna

Overview

The AD-55/E is a rugged, wideband UHF dipole manpack antenna designed for modern software-defined radios (SDRs), jammers, and scanners. Featuring a sleeve dipole center-fed architecture, it operates effectively without requiring a ground plane, ensuring reliable tactical performance.

Technical Summary

• Frequency Range: 700 to 920 MHz (UHF)
• Antenna Type: Sleeve dipole, center-fed
• Polarization: Vertical
• Power Handling: Up to 200 W CW
• Gain: +2 to +4 dBi
• VSWR: Typically < 2:1

Operational Use Cases

This antenna is engineered for tactical communication, signal monitoring, and jamming applications. Its wideband coverage and high power handling make it ideal for integration with broadband SDRs and high-power portable RF electronic systems.

Deployment Environments

Enclosed in a robust fiberglass radome, the antenna meets MIL-STD-810G standards and is explicitly built to withstand the harshest military and field environments.

Performance Metrics

The antenna delivers a gain of +2 to +4 dBi across the 700 to 920 MHz frequency band. It supports a maximum continuous wave (CW) power handling of 200 watts while maintaining a typical VSWR of less than 2:1.

Setup & Portability

Designed for manpack platforms, the center-fed sleeve dipole construction enables immediate operation without a ground plane, facilitating rapid deployment and mobility for dismounted personnel.

Compatibility

Designed for use with modern broadband software-defined radios, jammers, and scanners operating within the 700-920 MHz band. Verify the specific RF connector interface and physical mounting requirements with the manufacturer prior to deployment.

FAQs

• How does transmitter power impact antenna selection? Choosing an antenna that accommodates the maximum continuous output power and frequency range is paramount for survival. Ensure the antenna provides a sufficiently well-matched impedance to keep reflected power below damaging levels.
• Why choose a dipole over a monopole? A dipole provides a complete donut-shaped radiation pattern independently. A monopole requires a ground plane to form an image antenna and can lose gain or experience a lifted radiation pattern if ground conductivity is poor.
• How does vertical polarization affect radiation patterns? A vertically polarized omnidirectional antenna typically maximizes gain toward the horizon and exhibits radiation nulls directly above and below it. Verify the exact coverage using manufacturer principal plane patterns.
• Problems we solve: how do we narrow antenna choices? Balancing operating bands, coverage needs and mounting space can make antenna selection difficult. Share those constraints with Cyntony to compare candidate antennas and identify what needs manufacturer confirmation (Our process).
• Outcomes we deliver: what changed for Espy's compact monitoring system? Cyntony helped Espy source antennas that fitted a compact transit case and coordinated later sourcing revisions for removable mounting. This documented result concerns Espy's system; it does not establish this product's dimensions, mounting features or performance (Espy case study).

Video Notes