The DB42 MonstIR Pro is currently the largest of the Dream Beam series of Yagi antennas.
With 5 elements on 20m-6m and 3 elements on 40/30. For those who aspire to the pinnacle of performance, the DB42 provides coverage from 80m through 6m. The DB42 has a 49 ft looped driven element. This patented design allows us to make the end loop elements only 39 feet long, yet the performance is as if all 3 of the loop elements are 49 feet long. The folded dipole loop technology lets the footprint be 40% less than that of a full size yagi, losing only 0.4dB in gain performance.
The DB42 has a 80/60m dipole that works with the SDA 100 or OptimizIR controller for effortless tuning throughout the entire 80/60m band. The dipole runs parallel to the boom and uses the end elements as capacity hats, creating zero interaction with the rest of the antenna.
The 6m passive elements for the DB42 adds 3x fixed elements to the antenna, for a total of 8 elements on 6m. With no interaction or wind load added to the antenna, this creates a 6m Yagi with 14.0 dBi of gain and 25 dB of front to rear!
Weight 238 lb / 108 kg *Projected Area 32.38 sq ft / 3.00 sq m Longest Element 49 ft / 14.9 m Turning Radius 29 ft / 8.8 m Boom Length 43 ft / 13.0 m Mast Hardware 2.0 in / 5.08 cm Power Rating 3 KW (1.5KW on 60 and 80m) Frequency Coverage 3.5mHz — 54mHz Cable Requirements 24 conductor 22 ga shielded Tuning Rate 1.33 ft/sec - 0.4 m/sec
Band dBi Gain dB F/R 80m** 1.7 N/A 60m** N/A 40m 8.0 25.5 30m 9.0 12.4 20m 10.12 22.0 17m 10.8 23.2 15m 11.0 25.7 12m 11.9 24.1 10m 12.2 20.0 6m 5.0 (14.0)* 2.0 (25.0)*
* with 6m passive element kit ** with 80/60m dipole
*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.