12/02/2026
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📡 Multi-Band Doublet Antenna — One Wire for All HF Bands:
A Multi-Band Doublet Antenna is a center-fed dipole cut for the lowest band and fed using balanced ladder line into an antenna tuner. It does not need to be resonant on every band — the tuner matches it efficiently, making it one of the best multi-band HF antennas.
This antenna is low-cost, simple to build, highly efficient, and trusted by serious DX operators worldwide.
📏 Recommended Doublet Lengths (Total Wire Length → Each Side Length)
*160m band (1.8 MHz): Total 260 ft → 130 ft per side.
*80m band (3.5 MHz): Total 133 ft → 66.5 ft per side.
*60m band (5 MHz): Total 93 ft → 46.5 ft per side.
*40m band (7 MHz): Total 67 ft → 33.5 ft per side.
*30m band (10 MHz): Total 47 ft → 23.5 ft per side.
*20m band (14 MHz): Total 33 ft → 16.5 ft per side.
📌 Longer antennas tune more easily on multiple bands.
📡 Bands Covered A ladder-fed doublet can tune across:
160m, 80m, 60m, 40m, 30m, 20m, 17m, 15m, 12m, 10m
🧵 Feedline Recommendation ✔️ 450Ω Ladder Line (Best choice)
✔️ 600Ω Open Wire Line
❌ Avoid coax — high SWR causes RF loss and heat
🎛 Matching Equipment Required ✔️ Balanced Antenna Tuner:
✔️ OR 1:1 Current Balun + Unbalanced Tuner
❌ Avoid 4:1 balun — causes inefficiency and heat buildup.
🛠 Other Required Accessories • Antenna wire (14–18 AWG copper)
• Center insulator
• Two end insulators
• Ladder line spacers
• Support rope or paracord
• Mast or tree supports
• Feedline strain relief
• RF choke (optional but recommended)
• SWR meter or antenna analyzer
🏗 Installation Options Horizontal • Inverted-V • Sloper • Rooftop • Portable • Field Day.
📌 Keep ladder line away from metal objects for best performance.
⭐ Why Hams Love Doublets:
✅ One antenna for many HF bands
✅ No traps or loading coils
✅ Very low feedline loss
✅ Excellent DX and NVIS performance
✅ Cheap, efficient, proven design
✅ Often outperforms commercial antennas.
