AD-27/DB-3512-S — Dual-Band Monopole/Dipole Mobile Antenna

Overview

The AD-27/DB-3512-S is a heavy-duty dual-band monopole/dipole mobile antenna covering 30 to 108 MHz (VHF) and 225 to 512 MHz (UHF). Designed for tactical operations, it features a shock-absorbing stainless steel spring base and optional built-in GPS integration. A specialized monopole radiator design eliminates the need for a VHF ground plane, making the antenna highly versatile for both vehicular and mast-mounted applications.

Technical Summary

• Frequency Range: 30-108 MHz and 225-512 MHz
• Optional Integration: GPS L1 or L1/L2
• Power Handling: 100 W CW
• Polarization: Linear Vertical
• Gain Range: -12 dBi to +4 dBi
• Environmental: MIL-STD-810G compliant
• Color: Military Green (RAL-6014)

Operational Use Cases

This dual-band antenna provides robust RF connectivity for heavy-duty military tactical communications. It supports continuous operations across critical VHF and UHF frequency bands, offering reliable transmission and reception for voice and data networks in demanding field scenarios.

Deployment Environments

Engineered for harsh environments, the radiating element is built from highly durable composite materials and painted with UV-resistant paint to meet extensive MIL-STD-810G qualifications. The shock-absorbing spring base endures severe shocks and vibrations during ground vehicle transit, while the ground-plane-independent VHF design permits rapid deployment on fixed-site masts.

Performance Metrics

The antenna sustains maximum continuous power levels up to 100 W CW and includes built-in surge protection. Across its dual-band operating range, the omnidirectional radiation pattern yields gain levels spanning from -12 dBi to +4 dBi.

Setup & Portability

The antenna unit separates into an aluminum/plastic base and a composite radiating element. The base utilizes a standard NATO four-hole mounting pattern distributed evenly on a 4.5-inch (114.3 mm) circle, simplifying attachment to compatible vehicle brackets or mast fixtures.

Compatibility

Multiple versions are available to accommodate standard combined VHF/UHF transceivers. Configurations can be specified with or without the optional built-in GPS (L1 or L1/L2) antennas depending on navigation requirements.

FAQs

• How does a ground plane affect standard monopole antennas? Standard monopoles rely on a conductive surface below them to act as an electromagnetic image. The AD-27/DB-3512-S utilizes a specialized radiator design that eliminates the need for a VHF ground plane, allowing for installation on non-conductive masts.
• What does linear vertical polarization indicate? Vertical polarization describes the orientation of the radiated electric field perpendicular to the earth's surface. To maximize signal strength and avoid cross-polarization loss, ensure both transmitting and receiving antennas share the same vertical orientation.
• What is required to mount this mobile antenna? The antenna base utilizes a standard four-hole mounting pattern spaced on a 4.5-inch circle, complying with NATO specifications. Verify the bolt pattern on your vehicle or mast bracket to ensure compatibility with this interface.
• 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 did Cyntony's tactical-link field test establish? Cyntony's 2025 XTND-DIRECT field test showed how terrain, antenna height and clearance affected a specific mesh-radio link. The result informs deployment questions; it does not establish range, throughput or suitability for this product (Field-test account).

Video Notes