27Mhz 11m Band 1/2 wave Antenna

An 11-meter 27 MHz end-fed antenna is a type of half-wave antenna that’s fed from one end rather than the center, making it compact and easy to install—especially for CB (Citizens Band) radio or 10-meter amateur use.

Here’s how it works:

• Resonance: At 27 MHz, a half-wave antenna is about 5.5 meters long. When cut to this length, the antenna resonates naturally at that frequency, allowing efficient transmission and reception.
• End Feeding: Instead of feeding the antenna at the center (like a dipole), it’s fed at one end. This is convenient for mounting and stealthy setups, but it introduces a high impedance at the feed point.
• Matching Network: To deal with that high impedance (often around 2,500–3,000 ohms), a matching transformer—typically a 49:1 or 64:1 unun—is used to bring it down to something your radio can handle (like 50 ohms).
• Radiation Pattern: It radiates broadside to the wire, with a low-angle pattern ideal for long-distance (DX) communication.

These antennas are popular because they’re simple, lightweight, and can be strung up in tight spaces—even disguised as a clothesline in some setups.

Want help designing one for your space or tuning it for best performance

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