The 4 element has set the standard for performance in HF antennas.
With the addition of a 40/30M rotatable Dipole you will have unmatchable single antenna performance. With a 32 foot boom and weighing in at reasonable 106 lb, this antenna is ideal for DXers that want to maximize performance on 20m-6m and still have a dipole on 40 and 30 meters. The 4 element Yagi is configured for maximum gain and solid front-to-rear ratios.
Weight 106 lb/48.1 kg *Projected Area 18.15 sq ft / 1.69 sq m Longest Element 39 ft / 11.9 m Turning Radius 24.1 ft / 7.35 m Boom Length 32 ft / 9.75 m Mast Hardware 2.0 in / 5.08 cm Power Rating 3 KW Frequency Coverage 6.8 mHz—54 mHz Cable Requirements 16 conductor 22 ga shielded Tuning Rate 1.33 ft/sec - 0.4 m/sec
4 Element Performance Band dBi Gain DB F/R 40m 1.8* N/A 30m 2.1* N/A 20m 9.5 21 17m 10 20 15m 10.2 27 12 m 10.4 21 10 m 10.6 11 6 m 7.8 (13)** 4 (30)** * with 40/30 dipole ** with 6m passive element kit
*Projected area is the total perpendicular surface area measured in square feet/square meters, that is exposed to wind. To calculate wind load you always take the largest projected area whether that is from the perspective perpendicular to the boom or perpendicular to the elements. In the case of SteppIR Yagi’s, the maximum projected area will always be the sum of the surface area’s perpendicular to the Yagi elements. This calculation is a constant number and will not change regardless of EIA specification changes. Do not mistake this projected area calculation as anything more than a datapoint to present to your structural engineer, tower manufacturer or rotator manufacturer so that they can determine what is necessary for your application.
When sizing an antenna to a tower, many factors need to be taken into consideration including, but not limited to: projected area of antenna in square feet or square meters, weight of the antenna and other items on tower, turning radius, element lengths, antenna height, location exposure category, locations three-second gust wind-speed, locations maximum radial ice loading.
Improper specification of an antenna or rotator to a tower can result in product failure, injury or death. SteppIR is not an expert on tower or rotator sizing and for this reason will never make any kind of a recommendation – this specification process is meant for industry professionals such as a structural engineer, tower manufacturer or rotator manufacturer. Please do not attempt to self-specify our products – the information provided by SteppIR is to be utilized by industry professionals only.