The Diamond M150GSA is a premium, professional-grade single-band VHF mobile antenna engineered in Japan by Diamond Antenna. Designed for commercial vehicle fleets, public safety transceivers, and amateur radio mobile stations, this high-performance antenna features a rugged shock spring at its base. This specialized steel spring absorbs mechanical impacts from low-clearance branches, garages, and rough terrain, protecting both the whip and the vehicle’s mounting bracket from structural damage.
Operating natively across the 144–174 MHz range (and tunable down to 134 MHz via cutting chart), the M150GSA utilizes a reliable $1/4$-wavelength electrical architecture. It delivers a stable gain of 2.15 dBi, focusing the radiation pattern efficiently for mobile terrestrial propagation. With a compact physical length of just 0.51 meters and a lightweight design of 110 grams, it offers minimal wind resistance while managing heavy RF power loads up to 200 Watts. The base terminates in a standard MP (PL-259 Male) connector, ensuring a secure thread-on fit with standard mobile magnetic mounts or fixed chassis brackets.
SPECIFICATIONS & TECHNICAL FEATURES:
• Brand & Origin: Diamond Antenna (100% Original Japan)
• Antenna Type: Single-band VHF Mobile Antenna
• Frequency Range: 144–174 MHz (Tunable/adjustable from 134 MHz)
• Electrical Architecture: $1/4 \lambda$ wavelength configuration
• Base Protection: Integrated heavy-duty anti-shock stainless steel spring
• Gain Performance: 2.15 dBi
• Maximum Power Rating: 200 Watts (PEP)
• Nominal Impedance: 50 Ohms
• Voltage Standing Wave Ratio (VSWR): Less than 1.5:1
• Connection Interface: Standard MP (UHF Male / PL-259) base connector
• Physical Metrics: Total height of 0.51 meters and ultra-light net weight of 110 g
• Application: Perfect for utility vehicles, commercial logistics fleets, emergency service cars, forestry management, and off-road VHF communications.
