CompleTech CA140C4 offset pattern collinear - Frequency range: 135-145 MHz - Gain: 11 dBi - Polarization…

The CompleTech CA140C4 is a high-gain offset pattern collinear antenna designed for VHF communication in the 135-145 MHz frequency range. With an 11 dBi gain and vertical polarization, it delivers consistent signal transmission and reception for industrial telemetry, public safety, military communications, and land mobile radio systems. The antenna features a triangular feed design with field-adjustable radiation pattern and optional beam tilting for optimized coverage in challenging environments. Key specifications include a 50-ohm impedance, VSWR <1.5 for minimal signal reflection, and a robust radome constructed from UV-resistant ABS/FG with PU foam filling for superior weather resistance and IP67 ingress protection. The copper radiator ensures optimal RF performance and durability, while the N-/TNC-female connector provides secure, stable connections for coaxial cables. The antenna is designed for mounting on poles with diameters between 35-60 mm using an aluminum alloy bracket and stainless steel V-bolts with self-locking nuts for corrosion resistance. Environmental resilience is a core feature: the CA140C4 operates reliably across a temperature range of -40°C to +80°C, withstands wind loads up to 252 N, and includes DC-short circuited feed points for enhanced lightning protection. The integrated impedance compensation and RF choke further improve signal integrity and reduce interference. With a horizontal beamwidth of 179° and vertical beamwidth of 20°, this antenna provides wide-area coverage with controlled elevation for targeted communication. Applications include base station installations, repeater sites, remote monitoring systems, and mobile radio networks where consistent, high-gain performance is critical. The lightweight design and low wind load make it suitable for both fixed and temporary installations, including rooftop and tower setups. The CA140C4 is part of CompleTech’s ComAnt® series, known for frequency-independent data integrity and long-term reliability in demanding conditions.