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Call 0345 2300 599SPOOLTENNA ULTRA-EFHW4010
An ultra-compact 40-10m End Fed Half Wave antenna designed for operators who want to minimise pack size and weight without giving up full 100W SSB capability.
The SPOOLTENNA ULTRA-EFHW4010 takes the quick-deploy SPOOLTENNA concept and shrinks it into a package just 76 mm in diameter and approximately 162 g.
Designed for POTA, SOTA, backpacking, travelling and lightweight portable stations, the complete 65 ft radiating element winds directly onto the antenna body. It is factory tuned for the 40m, 20m, 15m and 10m amateur bands and requires no external antenna tuner under normal operation on those bands.
Built for Minimum Pack Size
The ULTRA version prioritises minimum size and weight. Its spool measures only 76 mm across, compared with 120 mm for the larger PARKS version, while the complete antenna weighs just 5.7 oz / approximately 162 g.
That makes it particularly attractive when the antenna is being carried with a lightweight transceiver, battery and feedline for a hilltop activation, portable holiday station or long-distance walk.
No Separate Wire Winder Required
The matching circuit and wire spool form one compact assembly, so the antenna can travel as a single self-contained unit rather than requiring a separate winder for the radiating element.
A low-profile winding knob makes recovery straightforward, while the supplied BongoTies® tie secures the wire once it has been wound back onto the spool.
Use a Screwdriver as the Axle
The 8 mm centre hole is designed so that a standard screwdriver can be passed through the spool and used as a temporary axle. Hold the axle and walk towards your operating position while the radiating wire unwinds from the spool behind you. The screwdriver is not supplied.
65 ft of 26 AWG BCCS Wire
To achieve the ULTRA's exceptionally low packed weight, the antenna uses approximately 65 ft of 26 AWG Bare Copper Clad Steel wire.
The high-strength, high-conductivity BCCS conductor is protected by a UV-resistant polyethylene jacket, providing a lightweight radiating element suited to repeated portable deployment.
No External ATU Required
Frequency ranges shown are the manufacturer's specified ranges. Always operate within the frequencies permitted by your amateur-radio licence.
Ready to Deploy, with Room for Final Adjustment
Each ULTRA-EFHW4010 is factory tuned before shipment, but additional wire length is deliberately left available for final adjustment. Installation height, angle and nearby objects can influence resonance, so this gives you room to optimise the antenna for your own preferred deployment.
Rear Thermal Venting
Thermal venting is incorporated into the rear of the ULTRA spool to help dissipate heat from the captive matching circuit during higher-duty-cycle operating modes.
BNC Feed & Quick-Release Radiating Element
RF connection is through a right-angle BNC female socket, positioning the feedline alongside the body of the spool rather than pointing directly away from it.
The radiating element connects through a 4 mm banana jack, allowing it to be disconnected quickly when required. Strain relief is provided at both ends of the radiating element to help protect the connections during deployment.
8 mm Mounting Points Front & Rear
The front and rear faces incorporate 8 mm mounting holes, providing several options for hanging, supporting or securing the spool as part of a portable antenna installation.
Keep the Complete Station Lightweight
SPOOLTENNA designed the ULTRA for use with lightweight portable coax such as RG-174 or RG-316. These cables help maintain the low overall weight of the station and avoid placing unnecessary mechanical strain on the BNC connector.
The manufacturer specifically cautions that heavier coax such as RG-8 or RG-8X can place undue strain on the BNC connection of a lightweight field antenna.
Serial-Specific Field Test Report Included
Every ULTRA-EFHW4010 is individually field tested and supplied with a Field Testing Report corresponding to that antenna's serial number.
Supplied with Your ULTRA-EFHW4010
Setup, Tuning & Technical Information
SPOOLTENNA provides the ULTRA Owner's Manual, Quick Start information and additional technical documentation through its official documentation centre.
View Manufacturer DocumentationSPOOLTENNA ULTRA-EFHW4010 Technical Specifications
Ultra-compact 40-10m portable End Fed Half Wave antenna with integrated wire spool and protected matching circuit.
| Model | ULTRA-EFHW4010 |
|---|---|
| Antenna type | End Fed Half Wave |
| Supported bands | 40m, 20m, 15m, 10m |
| Manufacturer frequency ranges | 7.0–7.3MHz / 14.1–14.35MHz / 21.0–21.45MHz / 28.0–29.7MHz |
| Maximum power | 100W SSB / 50W CW & digital |
| Antenna tuner | Not normally required on supported bands |
| Radiating element | Approx. 65 ft / 19.8 m |
| Wire | 26 AWG high-strength Bare Copper Clad Steel (BCCS) |
| Wire insulation | UV-resistant polyethylene jacket |
| RF connection | Right-angle BNC female |
| Radiating element connection | 4 mm banana jack |
| Spool diameter | 76 mm / 3 in |
| Spool thickness | Approx. 25 mm / 0.98 in, excluding BNC connector and winding knob |
| Weight | Approx. 5.7 oz / 162 g |
| Centre axle hole | 8 mm |
| Mounting holes | 8 mm, front and rear |
| Thermal management | Rear thermal venting for high-duty-cycle operation |
| Matching circuit | Captive within spool barrel |
Shipping & Delivery
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Additional return conditions may apply to equipment modified at the customer's request, including wideband transmit or receive modifications.
ML&S may charge a reasonable fee to reverse physical modifications and restore the equipment to its original factory specification. Any such charge will be agreed in advance and deducted from your refund.
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Royal Mail Return Label
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DPD Return Label
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Collection Service
DPD Collection
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New Equipment Warranty
Minimum 2-Year Warranty
All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.
Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.
Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.
Warranty exclusions may include batteries, normal wear and tear, accidental damage, misuse and unauthorised modifications, as specified in the applicable warranty terms.
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