BigIR Mark IV Vertical Antenna, 40m-6m Package

  • $1,551.00
  • $1,867.00
  • $287.00


Attaches to base of the BigIR vertical, expanding coverage to the 80m/60m bands. Power limit of 1.5kW for 80m/60m, 3kW on 40-6m. Additional 4 conductor cable required when adding this option.

Choose between 20m-6m, 40m-6m, or 80-6m band coverage for ground-mounted installations. Each ground radial kit consists of four 16 awg insulated wires, terminated in a single ring lug. We recommended 12 ground radials (3 kits) as a minimum starting point for vertical antennas.

5kW Choke balun in a waterproof housing, ideal for keeping RF from coming into the shack over the coaxial cable. Recommended using:
  • When elevating the base of a vertical antenna above the ground.
  • When only a few radials are used.
  • When the coax run is shorter than the radials.
  • When the ground condition is poor.

This cable must be run from the controller/remote driver board to the antenna directly, is responsible for powering the antenna’s EHUs (Element Housing Units), is double shielded to protect from RFI/EFI, and has a UV rated insulation. We do not recommend using this cable for lengths greater than 400ft (see remote driver board).

The voltage suppressor comes in a fully sealed weather-proof housing and helps protect the controller against ESD events like near-incident lightning or static storms.
  • Options Price: $0.00
  • Package Price: $1,746.00
  • Total: $0.00
SKU: 00417-SPS Category:


SteppIR Verticals are the only true ¼ wave continuous coverage antennas available for the HF bands.

The SteppIR technology has had a profound impact on improving vertical antenna performance over that of traditional designs – there is no substitute for having a true 1/4 wave vertical on every frequency within the coverage range, without having to “trick” the antenna into being resonant.  Being able to adjust the length of the element allows the SteppIR vertical to be mounted nearly anywhere and still provide a good match to your transceiver. As with all ¼ wave verticals, ultimate performance depends a good radial system. SteppIR verticals can be ground mounted or elevated above ground.

  • 40m-6m continuous coverage
  • 32 ft length
  • 15 lb total weight
  • 2 sq ft wind load
  • EIA 222C wind rating when guyed
  • Comes with SDA 100 controller
  • EHU high wind reinforcing and 1.5”mounting pole
  • Does not include optional 80m coil
  • Controller options:
  • Big IR / Small lR Specs
    Specifications BigIR 40-6 Vertical Small IR 20-6 Vertical
    Weight 15 lb / 6.8 kg 12 lb / 5.4 kg
    Wind Load 1.9 sq ft / 0.17 sq m 1.0 sq ft / 0.9 sq m
    Longest Element 33 ft / 10.05 m 18 ft / 5.49 m
    Optional Coil Yes – 80 m Yes – 40 m or 80/40 m
    Power Rating 3kW (1.5kW w/80 m coil) 3kW (500W w/80 m coil)
    Wind Rating 100 mph w/2 Guy Sets/h 100 mph
    Frequency Coverage 6.8 – 54 mHz 13.8 – 54 mHz
    Cable Requirements 4 conductor (8 with coil) 4 conductor (8 with coil)
    Tuning Rate 1.33 ft/sec – 0.4 m/sec 1.33 ft/sec – 0.4 m/sec
    Un-guyed Wind Rating 50 mph 100 mph

Additional information

Weight 20 lbs
Dimensions 5 × 7 × 93 in
Select Controller Type

SDA 100, OptimizIR