J-Antenna Omnidirectional (Circular) by AB-Antennas

Introducing the J-Antenna Omnidirectional (Circular) from AB-Antennas — a reliable radio component for VHF and UHF systems, designed for stable operation in challenging conditions. This antenna is ideal for mast mounting when uniform signal coverage around the antenna and vertical radiation polarization are required.

Key Features

• Type: J-antenna
• Directivity: Omnidirectional (circular)
• Polarization: Vertical
• Operating Frequency Range: 142…154 MHz (VHF) and 425…446 MHz (UHF)
• Gain: 4 dBi (VHF) / 5 dBi (UHF)
• Input Impedance: 50 Ohm
• Standing Wave Ratio (SWR): 1.4 (VHF) / 1.3 (UHF)
• Maximum Power: 1 kW (CW)
• Connector: UHF-female (SO-239)
• Materials: Aluminum, steel
• Height: 1400–1550 mm
• Weight: 500–520 g
• Mounting Type: Mast mount

The antenna is designed with the requirements of professional radio communications in mind: optimal gain in both bands ensures reliable signal reception and transmission, and SWR values indicate efficient matching with a 50 Ohm coaxial cable. Thanks to the combination of aluminum and steel, the design combines lightness and strength, simplifying installation and operation.

Installation and Operation Recommendations

It is recommended to install the antenna on a mast in an open area, at a height that ensures minimal interference with the circular radiation pattern. The UHF-female (SO-239) connector allows for quick connection of a standard cable with the appropriate plug. The antenna is designed for high power loads up to 1 kW in CW mode, making it suitable for professional radio stations and repeaters.

The technical parameters and build quality make this model an attractive solution for communication services, radio amateurs, and industrial applications. The AB-Antennas brand guarantees compliance with design standards and long-term operation when installation recommendations are followed.

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