Our 400W End Fed Half Wave (EFHW) antenna is a top choice for a highly efficient, mid-power solution, ideal for your QTH. Rated for 400W SSB and 100W Data, this antenna delivers excellent performance across the 80m–10m amateur radio bands.
 
Exceptional Efficiency & Design
At the heart of this antenna is a highly efficient 56:1 transformer, wound on a genuine Fair-Rite 2643251002 core. This design achieves 90%+ efficiency from 80m to 10m.
 
The antenna is constructed using our in-house designed PCB with double-sided tracks, ensuring durability and reliability. Components include:
3kV 100pF TDK capacitor
Stainless steel hardware
Heavy-duty insulator
IP65-rated ABS enclosure with ventilation to reduce condensation
 
Band Options
80m Version - Covers 80m, 40m, 20m, 15m, and 10m bands with no ATU required.
 
40m Version - Covers 40m, 20m, 15m, and 10m bands with no ATU required.

For  30m, 17m, and 12m bands you may need to use an ATU.
 
Both band options feature our 1.5mm stranded plain annealed copper wire, PVC-coated in black, and include a six-turn compensation coil for improved high-band matching.
 
Installation & Tuning
Universal mounting plate included, compatible with 2" poles
Antenna wire is supplied slightly longer than needed—trim or fold back the antenna wire in 5cm increments to achieve resonance
 
Important Notes
Your SWR may vary depending on antenna height, orientation, and surroundings
Always check SWR before use—an SWR exceeding 1.5:1 may damage your transceiver
 
This EFHW antenna is designed for reliability, efficiency, and long-term performance—a perfect addition to your amateur radio setup.
 
Lastly, please remember you should use a Common Mode Choke/Line Isolator with an EFHW.  We have several options available in our store.