• EFOC29 3.6kW ICAS 80-10M 8M Wire
  • Close-up view of the transformer 4:1 UNUN, part of the EFOC29 antenna system, showing its detailed construction.
  • Sturdy RVS mounting plate for secure installation of the EFOC29 antenna system in outdoor environments.
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RF Guru

3.6kW End-fed Off-Center EFOC29 80-10M

3.6kW End-fed Off-Center EFOC29 80-10M

€222,00 EUR
€222,00 EUR
Sale Sold out
Tax included.
Counterpoise
Version

Handmade product: fulfilment time varies with order volume. Please allow approximately 2–3 weeks for assembly and shipping.

Optional accessory · sold separately

Mast mounting: choose the Small kit

The antenna can be installed without this accessory. For a rigid enclosure-to-mast installation, add the Stainless Steel (RVS / INOX 316) Mounting Kit and select Small — 120 × 91 × 62 mm (4.72 × 3.58 × 2.44 in). Do not select the Large kit for this enclosure.

The EFOC29 is a 29 m multi-band, end-fed off-center antenna for portable, emergency, and permanent HF installations. It covers 80 m, 40 m, 20 m, 17 m, 15 m, 12 m, 10 m, and 6 m, with two power versions and two counterpoise configurations.

Choose your configuration

Power version

Single Core · 2.4 kW ICAS

  • 2,400 W PEP at VSWR < 2.0:1 (ICAS)
  • 1,200 W PEP at VSWR < 2.0:1 (CCS)
  • 850 W FT8/FT4 at VSWR < 1.5:1
Power version

Dual Core · 3.6 kW ICAS

  • 3,600 W PEP at VSWR < 2.0:1 (ICAS)
  • 1,800 W PEP at VSWR < 2.0:1 (CCS)
  • 1,250 W FT8/FT4 at VSWR < 1.5:1
Counterpoise option

Counterpoise integrated in coax

Includes 26 m of EXTRAFLEX-BURY-7 coaxial cable. Two large ferrite chokes are included and should be installed at approximately 12 m for about +20 dB common-mode rejection.

Counterpoise option

M6 terminal + 13 m counterpoise wire

Uses a dedicated counterpoise wire connected to the stainless-steel M6 terminal. This version does not include the 26 m coaxial cable or the large ferrite chokes.

High-band performance note

On 15 m, 12 m, and 10 m, the 29 m wire is longer than two wavelengths. Expect a more complex radiation pattern with multiple lobes and nulls, so performance depends strongly on orientation and installation geometry. These bands are supported, but they are not the antenna’s most efficient operating range.

At a glance

Wire length
29 m (approximately 95.1 ft)
Near-resonant bands
80 m, 40 m, 20 m, 17 m, 12 m, and 10 m
May require a tuner
60 m requires an external tuner. 30 m and 15 m may require one depending on installation height and surroundings.
Matching transformer
Integrated 4:1 UNUN for 50 Ω systems
Insertion loss
Less than 0.2 dB
Typical VSWR
Less than 2.5:1 on supported bands with a suitable installation
Connector
Professional-grade SO-239; weatherproof to IP66 when properly sealed
Enclosure
UV-resistant, shock-resistant polycarbonate housing; IP64
Approximate weight
650 g (1.43 lb)

Construction

  • Ferrite core: optimized for stability and low loss.
  • Transformer: integrated 4:1 impedance transformer wound with heat-resistant PTFE wire.
  • Antenna wire: 29 m of hard-drawn, tinned copper with a durable XLPE sheath.
  • Wire construction: flexible, stranded, 2 mm diameter, intended for stationary outdoor installations.
  • Weather protection: rugged polycarbonate enclosure, UV-resistant, shock-resistant, and rated IP64.

Installation and technical details

Installation guidance

Antenna performance and SWR depend on installation height, geometry, nearby structures, soil conditions, feedline routing, and nearby metal. Measure SWR after installation and fine-tune the setup for your environment.

For practical layouts, see the EFOC29 Installation Guide and the EFOC Mounting Advice.

Common-mode choke guidance

The basic included choke arrangement is intended for approximately 200 W SSB / 100 W FT8 with suitable placement. Higher-power or highly compromised installations may require a higher-performance choke.

Read: Optimizing End-Fed Antennas with High-CMR Chokes

Power-rating definitions

ICAS applies to intermittent service; CCS applies to continuous service. Digital-mode limits also depend on VSWR and duty cycle.

Read the full ICAS, CCS, and digital power explanation

SWR and environmental disclaimer

RF.Guru’s reference measurements are made in an open environment with the antenna approximately 8 m above ground. Your results may differ because of:

  • installation height and antenna geometry;
  • trees, buildings, power lines, fences, and other nearby objects;
  • soil composition, moisture, and terrain;
  • feedline length, quality, and common-mode current; and
  • nearby metallic surfaces that can detune the antenna.

Learn more

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