{"product_id":"shakespeare-unity-gain-heavy-duty-ais-antenna-0-3m","title":"Shakespeare MD23-AIS Unity Gain Heavy Duty AIS Antenna 0.3m Marine Low Profile","description":"\u003c!-- \n  ***********************************************************\n  EBAY LISTING DATA\n  ***********************************************************\n  OPTIMIZED EBAY TITLE (80 Chars): Shakespeare MD23-AIS Unity Gain Heavy Duty AIS Antenna 0.3m Marine Low Profile\n  SEO NOTES: Grounded in SKU research for MPN MD23-AIS. Features high-durability helical design for AIS frequencies. Compatibility verified for all AIS transponders\/receivers. Includes technical specifications and Q\u0026A.\n--\u003e\n\n\u003cdiv style=\"font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 1.6; color: #333333; max-width: 900px; margin: 0 auto;\"\u003e\n\n  \u003cscript type=\"application\/ld+json\"\u003e\n  {\n    \"@context\": \"https:\/\/schema.org\/\",\n    \"@type\": \"Product\",\n    \"name\": \"Shakespeare Unity Gain Heavy Duty AIS Antenna - 0.3m\",\n    \"description\": \"Premium 0.3m (1ft) low-profile helical AIS antenna designed for high-durability marine applications. Pre-tuned specifically for AIS frequencies with an over-moulded epoxy design.\",\n    \"brand\": { \"@type\": \"Brand\", \"name\": \"Shakespeare\" },\n    \"sku\": \"MD23-AIS\",\n    \"mpn\": \"MD23-AIS\",\n    \"offers\": {\n      \"@type\": \"Offer\",\n      \"url\": \"https:\/\/4boats.co.uk\/products\/shakespeare-unity-gain-heavy-duty-ais-antenna-0-3m\",\n      \"priceCurrency\": \"GBP\",\n      \"price\": \"{{ product.price | money_without_currency }}\",\n      \"availability\": \"https:\/\/schema.org\/InStock\"\n    }\n  }\n  \u003c\/script\u003e\n\n  \u003cdiv style=\"background-color: #2c3e50; color: #ffffff; padding: 40px 20px; text-align: center; border-radius: 6px 6px 0 0;\"\u003e\n    \u003ch1 style=\"margin: 0; font-size: 28px; letter-spacing: 1px; text-transform: uppercase; color: #ffffff;\"\u003eShakespeare MD23-AIS Antenna\u003c\/h1\u003e\n    \u003cp style=\"margin: 10px 0 0; font-size: 18px; color: #ecf0f1;\"\u003eHeavy Duty Unity Gain Low-Profile AIS Antenna (0.3m)\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"padding: 25px; border: 1px solid #e0e0e0; border-top: none; background-color: #ffffff;\"\u003e\n    \u003cp style=\"margin-top: 0;\"\u003eThe \u003cstrong\u003eShakespeare MD23-AIS\u003c\/strong\u003e (V-Tronix series) is a high-performance, low-profile helical antenna specifically engineered for the Automatic Identification System (AIS). Measuring just 0.3m (approx. 1ft) in height, this \"Squatty Body\" style antenna is designed to withstand the most rugged marine environments while maintaining excellent signal reception for AIS transponders and receivers.\u003c\/p\u003e\n    \u003cdiv style=\"background-color: #f8f9fa; border-left: 5px solid #27ae60; padding: 15px; margin: 20px 0;\"\u003e\n      \u003cstrong style=\"color: #27ae60;\"\u003eRELIABILITY:\u003c\/strong\u003e Featuring an over-moulded helical design with all electrical parts sealed in epoxy resin to prevent water ingress and corrosion.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"display: flex; flex-wrap: wrap; margin-top: 20px; gap: 20px;\"\u003e\n    \u003cdiv style=\"flex: 1; min-width: 300px; border: 1px solid #e0e0e0; border-radius: 6px; padding: 20px; background-color: #ffffff;\"\u003e\n      \u003ch3 style=\"color: #2c3e50; border-bottom: 2px solid #3498db; padding-bottom: 10px; margin-top: 0;\"\u003eKey Features\u003c\/h3\u003e\n      \u003cul style=\"list-style-type: none; padding: 0; margin: 0;\"\u003e\n        \u003cli style=\"padding: 10px 0; border-bottom: 1px dashed #eee;\"\u003e✔ Specifically pre-tuned for AIS frequencies\u003c\/li\u003e\n        \u003cli style=\"padding: 10px 0; border-bottom: 1px dashed #eee;\"\u003e✔ Low windage and unobtrusive low-profile\u003c\/li\u003e\n        \u003cli style=\"padding: 10px 0; border-bottom: 1px dashed #eee;\"\u003e✔ Epoxy-sealed for extreme weather resistance\u003c\/li\u003e\n        \u003cli style=\"padding: 10px 0; border-bottom: 1px dashed #eee;\"\u003e✔ Includes 20m RG-58 cable and bracket\u003c\/li\u003e\n        \u003cli style=\"padding: 10px 0; border-bottom: 1px dashed #eee;\"\u003e✔ No ground plane required\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1; min-width: 300px; border: 1px solid #e0e0e0; border-radius: 6px; padding: 20px; background-color: #ffffff;\"\u003e\n      \u003ch3 style=\"color: #2c3e50; border-bottom: 2px solid #3498db; padding-bottom: 10px; margin-top: 0;\"\u003eTechnical Specs\u003c\/h3\u003e\n      \u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eFrequency:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee; text-align: right;\"\u003e161.975 - 162.025 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eGain:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee; text-align: right;\"\u003eUnity (0 dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eLength:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee; text-align: right;\"\u003e0.3m (1ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eVSWR:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee; text-align: right;\"\u003e\u0026lt; 1.5:1 at Resonance\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eImpedance:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee; text-align: right;\"\u003e50 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eCable Supplied:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee; text-align: right;\"\u003e20m RG-58\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eConnector:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 0; border-bottom: 1px solid #eee; text-align: right;\"\u003ePL-259 (Fitted)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin-top: 30px;\"\u003e\n    \u003ch3 style=\"background-color: #34495e; color: #fff; padding: 12px 15px; margin: 0; border-radius: 6px 6px 0 0; text-align: center;\"\u003eCompatibility \/ Fitment Guide\u003c\/h3\u003e\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n      \u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ddd;\"\u003e\n        \u003cthead\u003e\u003ctr style=\"background-color: #ecf0f1;\"\u003e\n\u003cth style=\"padding: 12px; border: 1px solid #ddd; text-align: left;\"\u003eMake\/System\u003c\/th\u003e\n\u003cth style=\"padding: 12px; border: 1px solid #ddd; text-align: left;\"\u003eModel\/Application\u003c\/th\u003e\n\u003cth style=\"padding: 12px; border: 1px solid #ddd; text-align: left;\"\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAIS Transponders\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAll Class A \u0026amp; B Transponders\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eRaymarine, Garmin, Simrad, Icom, etc.\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eAIS Receivers\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eStandard Marine AIS Receivers\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eIdeal for dedicated AIS reception\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eVessel Types\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSailboats, RIBs, Tenders, Powerboats\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eBest where height is restricted\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin-top: 30px;\"\u003e\n    \u003ch3 style=\"background-color: #34495e; color: #fff; padding: 12px 15px; margin: 0; border-radius: 6px 6px 0 0; text-align: center;\"\u003eOEM Cross Reference\u003c\/h3\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ddd;\"\u003e\n        \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd; font-weight: bold; width: 40%;\"\u003eShakespeare\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eMD23-AIS\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd; font-weight: bold;\"\u003eV-Tronix\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eMD23-AIS\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd; font-weight: bold;\"\u003e4Boats SKU\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e818-MD23-AIS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin-top: 30px; background-color: #fcfcfc; border: 1px solid #e0e0e0; border-radius: 6px; padding: 20px;\"\u003e\n    \u003ch3 style=\"color: #2c3e50; border-bottom: 2px solid #3498db; padding-bottom: 10px; margin-top: 0;\"\u003eQuestions \u0026amp; Answers\u003c\/h3\u003e\n    \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n      \u003cp style=\"margin: 0 0 5px 0; font-weight: bold; color: #333;\"\u003eIs this a genuine original part?\u003c\/p\u003e\n      \u003cp style=\"margin: 0; color: #666; font-size: 15px;\"\u003eYes, this is a genuine Shakespeare\/V-Tronix product, supplied in original retail packaging with all included accessories.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n      \u003cp style=\"margin: 0 0 5px 0; font-weight: bold; color: #333;\"\u003eHow do I know if it is compatible?\u003c\/p\u003e\n      \u003cp style=\"margin: 0; color: #666; font-size: 15px;\"\u003eThis antenna is compatible with any AIS transponder or receiver that requires a 50-ohm antenna input. It is specifically tuned for the AIS frequency band (162MHz).\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"margin-bottom: 0;\"\u003e\n      \u003cp style=\"margin: 0 0 5px 0; font-weight: bold; color: #333;\"\u003eCan this be used for standard VHF voice radio?\u003c\/p\u003e\n      \u003cp style=\"margin: 0; color: #666; font-size: 15px;\"\u003eNo. This antenna is pre-tuned specifically for AIS frequencies (161.975MHz to 162.025MHz). Using it for standard Marine VHF (156MHz) may result in high SWR and poor performance.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin-top: 30px; text-align: center; font-size: 14px; color: #7f8c8d; border-top: 1px solid #eee; padding-top: 20px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Please verify your technical requirements against the specifications above before purchasing. Distributed by 4boats.co.uk.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"4Boats","offers":[{"title":"Default Title","offer_id":56755491504502,"sku":"818-MD23-AIS","price":153.46,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0621\/8140\/9004\/files\/818-md23-ais.jpg?v=1770683627","url":"https:\/\/www.leighnumberplates.com\/products\/shakespeare-unity-gain-heavy-duty-ais-antenna-0-3m","provider":"Leigh Number Plates","version":"1.0","type":"link"}