Specifications
| Impedance | 50 Ohms |
| Connector | UHF socket (SO-239), N type socket on request |
| Gain | max. 5-6 dBi in free space (3-4 dB over dipole) |
| F/B ratio | peak >20 dB (varies by band) |
| SWR | <2 over the entire band (20/17/15/12/6m), 10m band: 28-29.3 MHz |
| Rated power | 1500 watt |
| Elements | high strength and flexible tinned stranded copper wire 1.0 mm² (AWG 18), black PVC insulation |
| Spreaders | flexible and sturdy fiberglass rods, UV resistant, 10 mm (~0.4") diameter |
| Support cords | 1.5 mm Dyneema® rope, UV resistant |
| Center post | high quality aluminium tubing 30 x 2 mm (~1.2" x 0.08") |
| Mounting hardware | all stainless steel A2 |
| Other plastic parts | injection molded from PBT (polybutylenterephthalate) black, high impact, UV resistant |
| Turn radius | approx. 3.20 m (10.6 ft.) |
| Weight | approx. 6 kg (13 lbs) |
| Wind load area | approx. 0.25 m² (2.7 sqft.) |
| Size when collapsed | approx. 1.15 m (45") x 15 cm (6") x 15 cm (6") |
| Antenna fixture | fiberglass rod 5" x 1" O.D., e.g. fits into telescope masts with top section of 26 mm (1") I.D. |
A cheap TV rotator can be used to turn the beam due to the symmetric structure, and the low center of gravity, low weight and wind load.
SWR plots
taken with calibrated Telepost Inc. LP-100 SWR & Watt meter, TRX Icom IC-7000, feed cable 20 meters RG-58U.
SWR at antenna
feedpoint is somewhat higher due to cable losses.
Radiation plots
The plots for azimuth and elevation, as well as angular attenuation can be found here:
[deleted]