The Faulkner FM Loop Antenna is a popular and highly effective design among FM radio enthusiasts and DXers worldwide. It provides excellent reception over the 87.5–108 MHz FM broadcast band and can be built easily using common materials. Despite its simple structure, it performs as well as many commercial indoor FM antennas.
The antenna uses a square loop with each side measuring 30 inches (78 cm). It’s made from insulated wire or copper tubing and mounted on a rigid frame. The feed point is placed at the bottom of the loop at positions A and B, where the twin-lead cable connects to the radio receiver.
Faulkner FM Loop Antenna: Key Specifications:
- Dimensions: 30 × 30 inches (78 × 78 cm)
- Frequency Range: 87.5–108 MHz
- Impedance: 300 ohms (use a 4:1 balun for 75-ohm coax)
- Feed Point: Bottom center (A and B)
This compact design fits easily indoors and provides strong, stable reception.
The diagram above illustrates the basic, yet powerful, geometry of this antenna: a single square loop.
- Dimensions: Each side of the loop measures exactly 30 inches (78 cm). These precise dimensions are critical, as they allow the antenna to resonate efficiently around the 98 MHz center point of the global FM broadcast band (87.5 – 108.0 MHz).
- Construction: While this design can be made from various materials (copper pipe, wire), it is often constructed from a single continuous length of 75-ohm coaxial cable, which is cheap and readily available.
- Feed Point (A & B): The connection points (labeled A and B) are located at the center of the bottom leg. This is where you connect your twin-lead or coaxial feedline to your tuner or receiver. Connecting here typically yields horizontal polarization for receiving horizontally polarized signals, which is common for FM broadcast.
The Legend of the Faulkner FM Loop Antenna
This specific, simple square loop is perhaps best known in the radio enthusiast community as the “Faulkner FM Loop Antenna.”As detailed by John Faulkner (G1VVP) on his Skegness DX blog, this design is rooted in the early days of radio DXing and is essentially a simplified, folded variation of the venerable Cubical Quad antenna.
The reason for its lasting popularity is its remarkable performance for such a basic design:
- Gain: It offers noticeable gain over a standard half-wave dipole, improving signal strength.
- Nulls: The antenna has a figure-eight radiation pattern with very deep nulls off the sides. This is a game-changer for DXers (long-distance listeners) and those with strong local interference, as you can physically rotate the antenna to completely eliminate unwanted signals and reveal weaker stations hiding behind them.
- Indoor Performance: It is highly forgiving and works extremely well indoors, making it ideal for apartment dwellers or those who cannot install an exterior antenna.
If you are looking for a weekend DIY project that seriously boosts your FM listening quality without breaking the bank, the 30-inch square FM Loop is one of the best antennas you can build.
Need of outdoor FM Radio antenna
For the serious hobbyist or high-fidelity listener, an FM antenna isn’t just an accessory; it is the most critical component of the signal chain. You can own a vintage Marantz or a high-end SDR, but without a resonant antenna, you are essentially listening to a “choked” version of the broadcast.
1.Clean Signals vs. Urban Noise
In our modern RF-saturated world, the “mud” of electromagnetic interference from LEDs and Wi-Fi can easily swamp a weak FM signal. A dedicated antenna provides the gain necessary to lift a station out of this noise floor. More importantly, it tackles multipath distortion. By using a directional or properly placed antenna, you stop your receiver from getting “confused” by signals bouncing off nearby buildings, which is the primary cause of that grainy, harsh distortion that ruins a good listening session.
Multipath distortion occurs “when an FM signal reaches the receiving antenna by two or more separate transmission paths
2.The Pursuit of Stereo Perfection
For the audiophile, the goal is “stereo lock.” FM stereo broadcasting requires a much stronger signal-to-noise ratio than mono. When your antenna is inadequate, the soundstage collapses, and a persistent “hiss” creeps into the high frequencies. A tuned half-wave antenna ensures the tuner receives enough signal to provide a wide, lush soundstage and the full dynamic range the station intended. Whether you’re chasing distant DX stations or ensuring your local jazz station sounds transparent, the antenna is your primary tool for unlocking the true potential of the airwaves.
Related Posts
- Full Wave Loop Antenna for VHF, UHF & FM Radio Bands
- FM Bazooka Antenna for Superior FM Radio Reception (88–108 MHz)
- Slim-Jim Antenna for FM Broadcast Band reception (88–108 MHz)