HF base station loop antenna, NVIS, 2.5 m, diameter, 1.6-30 MHz


The HF230L-B is a compact HF antenna for rapid deployment to create a base station working from 1.6 to 30 MHz. It is designed to provide superior Near Vertical Incident Skywave (NVIS) performance at distances from 0 to 500 km and allows continuous communications in ground wave, NVIS and skywave applications.

The communications characteristics of the antenna are similar to a wire antenna mounted on a 10 m mast.

The HF230L-B is a direct replacement for existing mast mounted HF base station antennas with the important advantage of only requiring a fraction of the time and space to install. The mounting of the system only takes a few minutes and requires no special installation equipment.

This new generation HF antenna is difficult to detect because of its small size and, most importantly, it reduces co-site interference with other HF and all VHF/UHF whip antennas.

Frequency Range 1.6-30 MHz
Impedance 1 to 1000 Ω
50 Ω nominal
Power Rating 400 W PEP and average
Gain – 10 dBi @ 3.5 MHz
– 4 dBi @ 10 MHz
Radiation Pattern Omnidirectional for NVIS
Power Supply 18-32 V DC, normally supplied from Power Amplifier
Connector 10 mm stud for RF
MIL-C-5015, 7 pin for interface to ATU and supply voltage
Interface The antenna has two digital inputs and one output, and a RS485 serial port
Software is then configured depending on radio system
Design Copper braided fibreglass collapsible radiating loop. Feed tower made from aluminium and fibreglass.
Size Base Plate: 115 x 30 cm
Radiating Loop: 250 cm diameter
Weight approximately 17 kg (without ATU)
Wind Rating 55 m/s = 201 km/h
Finish Anodize, Black
Radiating element covered with black heatshrink tube
Environmental Test Method: Per MIL-STD-810F
Shock and Vibration: Transportation
Water Resistance: IP67
Temperature Range: – 40°C to + 71°C
Installation see Comrod installation manual