The Shakespeare 5215-AIS, affectionately known as the “Squatty” or “Squatty SEO” among sailors, is a purpose-built antenna designed specifically for VHF Automatic Identification System (AIS) operation. Its compact 36-inch (3-foot) profile makes it the ideal solution for sailboats and powerboats where a full-sized VHF antenna is impractical, without compromising on the critical performance needed for safety at sea.
Engineered for reliability, this end-fed fiberglass whip antenna ensures your AIS transceiver or receiver can send and receive vessel data clearly and effectively, significantly boosting your situational awareness and collision avoidance capabilities.
Key Features & Benefits
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Optimized for AIS Performance: Precisely tuned to the dedicated AIS frequencies (161.975 MHz & 162.025 MHz). This specialized tuning provides a superior Voltage Standing Wave Ratio (VSWR) specifically for AIS, ensuring maximum power transfer and reception sensitivity compared to a standard VHF antenna.
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Compact & Low-Profile Design (36-Inch): Its short 3-foot length is perfect for mounting in locations where a taller antenna would be problematic. It’s an excellent choice for:
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Sailboats: Avoids interference with backstays and sails.
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Trawlers & Tugboats: Fits neatly on pilot houses and lower rails.
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As a Secondary Antenna: Dedicated AIS operation, leaving your primary VHF antenna free for communication.
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Superior End-Fed Design: The “end-fed” construction places the radiating element along the entire length of the antenna, providing an efficient signal pattern for optimal AIS target acquisition, even from vessels at a similar height.
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Durable Marine-Grade Construction: Built to withstand the harsh marine environment.
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Fiberglass Whip: Provides excellent flexibility and resilience against impact and vibration.
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Stainless Steel Fittings: Corrosion-resistant stainless steel base, spring (optional), and hardware ensure long-lasting performance in saltwater conditions.
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Weatherproof Seal: Protects the internal components from moisture, ensuring reliability in all weather.
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Easy Installation: Features a standard 1″-14 thread base, making it compatible with most common marine antenna mounts. It can be easily installed on a rail, mast, or hardtop using an appropriate mount.
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Sleek White Finish: The classic white fiberglass design looks great on any vessel and maintains a low visual profile.
Technical Specifications
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Model: Shakespeare 5215-AIS
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Description: 36-Inch AIS Antenna, End-Fed, White Whip
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Frequency Range: VHF AIS Band (161.975 MHz & 162.025 MHz)
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Gain: Typically 3 dB (relative to a 1/2-wave dipole)
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Length: 36 inches (3 Feet / 91.4 cm)
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Base Connector: Standard 1″-14 Thread (Requires separate antenna mount)
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Cable Connection: SO-239 (UHF) Female Connector (PL-259 compatible)
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Radial Plane: Not Required (End-Fed Design)
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Color: White
Who Is This Antenna For?
The Shakespeare 5215-AIS is the perfect choice for:
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Sailboat owners needing a dedicated AIS antenna that won’t interfere with rigging.
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Any boater installing a Class A or Class B AIS transceiver who wants a properly tuned antenna.
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Boaters using an AIS receiver to enhance their navigation and safety.
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Vessels with limited space for antenna installation.
