GP-136-155

Overview: GP-136-155 Broadband Omnidirectional Ground Plane Antenna

The GP-136-155 is a high-reliability, military-grade Broadband Ground Plane Antenna precision-tuned for the 136–155 MHz VHF band. This rugged, all-weather aperture is engineered for mission-critical applications where signal purity and mechanical survivability are paramount. Whether deployed for high-power jamming, spectrum monitoring, or tactical base station communications, the GP-136-155 provides an elite single-antenna solution that eliminates the need for multiple narrowband arrays.

Tactical Engineering & Construction

Sealed-unit architecture for zero-maintenance operation in extreme theaters. The antenna core features a large-diameter aluminum radiating element, which is completely enclosed within a high-tech ruggedized fiberglass radome. This enclosure ensures that the antenna remains unaffected by environmental factors like moisture, ice, or corrosive gases. The use of 6063T6 ultra-corrosion-resistant architectural aluminum combined with a specialized internal design prevents the formation of "signal cells," effectively eliminating inter-modulation. The base is constructed from a heavy-duty 100 mm x 100 mm "L-type" aluminum plate for secure mounting.

Operational Efficiency

True omni-directional dominance with superior signal saturation. The GP-136-155 delivers a stable 2 dBi gain and an exceptional VSWR of better than 1.5:1 across its entire operating range. It requires no field tuning, allowing for immediate tactical deployment. The wide 78-degree vertical beamwidth is specifically designed for "null fill," ensuring consistent signal coverage at varying elevations and close proximity. With a massive 500-Watt power handling capacity, it is a dominant choice for high-intensity electronic warfare and persistent convoy protection.

Detailed Technical Features

• Optimized VHF Window: Targeted coverage for the 136–155 MHz range, providing high efficiency for public safety and military VHF bands.
• Radome-Shielded Array: Radiating elements are housed in a high-strength fiberglass tube, ensuring survivability against sand abrasion and saline air.
• Elite Power Handling: Supports up to 500 Watts of continuous RF power for robust tactical broadcasting and electronic attack.
• True Omni-Directional Pattern: Provides uniform 360-degree horizontal coverage for total situational awareness.
• Inter-Modulation (IM) Suppression: All-aluminum internal architecture eliminates internal diode effects and harmonic interference.
• Compact Logistics Design: Removable stainless steel ground radials allow for a 0.55-meter shipping length, facilitating easy man-portable transport.
• Marine-Grade Material Suite: Mounting hardware and all four GP elements are fabricated from Type 316 Stainless Steel for elite coastal durability.
• Input Termination: Features a professional-grade N-Female connector for low-loss, high-reliability electrical transfer.

Detailed Environmental Features (MIL-STD-810G Hardened)

The GP-136-155 is built to perform in the world's most demanding theaters:

• Thermal Survival: Certified for High/Low Temperature extremes (Method 500.5/502.5).
• High-Velocity Wind Rating: Aerodynamically optimized to survive constant winds up to 200 Km/Hr.
• Ingress & Humidity Defense: Fully functional in 95% relative humidity and resistant to high-velocity horizontal rain (Method 506.5).
• Mechanical Resilience: Tested for High-Impact Shock (Procedure IV) and Tactical Vibration (Procedure I) for vehicle or tower deployment.
• Biological Defense: Treated for Fungus Resistance (Method 508.6) to prevent degradation in tropical environments.

Key Advantages, Benefits & Applications

Key Advantages:

• Boresight Pattern Stability: The ruggedized fiberglass housing maintains the antenna’s radiation characteristics even in high-vibration or iced-over conditions.
• Rapid Deployment Readiness: Zero field tuning and removable radials mean the system is operational in minutes.
• Exceptional Null Fill: Wide vertical beamwidth ensures no "blind spots" for ground-level units or low-flying assets.

Key Applications:

• Convoy & VIP Protection: Creating a persistent high-power jamming "bubble" for VHF-controlled threat denial.
• VHF Spectrum Monitoring: High-sensitivity intercept for SIGINT and regulatory monitoring.
• Military Base Stations: Ruggedized primary antenna for tactical Command and Control (C2) links.
• Shipboard & Coastal Surveillance: Marine-grade materials ensure long life in high-salinity maritime environments.

Electrical Specification

Mechanical Specification