The Semi-Delta Antenna is an economical broadband HF base station antenna covering 2 to 14 MHz with omni-directional coverage for short to medium distance NVIS and longer distance HF communications.
Broadband HF coverage from 2 to 14 MHz with a nominal 50 ohm impedance and typical VSWR better than 2.5:1.
Broadband design eliminates a separate antenna tuner unit; connects to the transceiver via a single coaxial cable.
Omni-directional radiation combining high and low angle coverage for both NVIS and longer distance HF links.
400 W PEP (240 W average) via UHF-type, or 1000 W (600 W average) via N-type, full duty cycle voice and data.
15 m and 1.5 to 2 m anchor points at 20 m spacing suit installations with limited space available.
Supplied partially assembled; built quickly without special tools, with the balun at the lower end for easy feed.
Long service life materials with a 160 km/h wind rating (no ice) for harsh outdoor environments.
| Product type | Semi-Delta Antenna (broadband HF base station antenna) |
|---|---|
| Application | Short to medium distance HF communications; NVIS and longer distance links |
| Radiation pattern | Omni-directional, combining high and low angle radiation |
| Antenna tuner | Not required; broadband design connects via single coaxial cable |
| Counterpoise | Recommended for poor soil conductivity or non-conductive roof installations |
| Accessories | RG58 or low loss RG213 coaxial cables; lightning protection; copper earth strap; earth stake |
| Frequency range | 2 to 14 MHz |
|---|---|
| Power rating | 400 W PEP (240 W average) or 1000 W (600 W average) |
| Nominal impedance | 50 ohm |
| VSWR | Typically < 2.5:1 |
| RF connector type | UHF-type (400 W); N-type (1000 W) |
| Duty cycle | Full duty cycle voice and data at rated power levels |
| Mast heights | 15 m mast and 1.5 to 2 m stub mast |
|---|---|
| Mast spacing | 20 m |
| Balun mounting | 2 x U-bolts to suit 50 mm diameter tube |
| Wind rating | 160 km/h, no ice |
| Packed weight | 8 kg (400 W); 11 kg (1000 W) |
| Packed dimensions | 880 mm x 340 mm x 100 mm (excluding mast hardware) |
| Installation hardware | Pulley/halyard suitable for a 15 m mast |
Semi-Delta Antenna delivers broadband HF coverage from 2 to 14 MHz with a typical VSWR better than 2.5:1 and omni-directional high and low angle radiation, supporting both NVIS and longer distance voice and data links without a separate antenna tuner. A compact footprint, fast tool-free assembly, a 160 km/h wind rating and power handling to 1000 W make this HF antenna a dependable base station choice where space and budget are tight. Backed by DTC engineering and worldwide service, the Semi-Delta Antenna keeps the net up wherever HF communications are deployed.