{"product_id":"kjm-a1591-v-9db-vhf-marine-antenna-15-2-ft-white","title":"KJM A1591-V 15.2 Foot 9dB VHF Marine Antenna, White Fiberglass","description":"\u003cp class=\"nvn-hero\"\u003eThe KJM A1591-V is a serious offshore VHF antenna. At 15.2 feet with 9 dB of gain, it's built to pull radio traffic and weather from a long way out. White fiberglass over brass radiators, a stainless ferrule, and 20 feet of RG-8X coax already attached. If range is what you're after, this is the stick.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe KJM A1591-V is a big antenna for boaters who want every mile of VHF range they can get. At 15.2 feet with 9 dB of gain, it's the kind of whip you put on an offshore powerboat, a sportfisher, or a serious cruiser that spends real time away from the coast. Mount it up high and clear of obstructions, and it'll pull in radio traffic, bridge calls, and weather broadcasts from a long way out. On the water, range is safety, and this is a range antenna first and foremost.\u003c\/p\u003e\n\u003cp\u003eHere's the thing about 9 dB gain. A tall, high-gain antenna doesn't make more power, it just squeezes the signal into a flatter pattern aimed right at the horizon. That's exactly what you want on a stable platform like a bigger powerboat, where the antenna stays roughly vertical. It's the reason a 9 dB stick outreaches a short 3 dB or 6 dB antenna on open water. The tradeoff is that the beam is narrow up and down, so a boat that heels or rolls hard can drop out of the pattern for a moment. If you're on a sailboat that heels 20 degrees under way, a lower-gain antenna often holds a more consistent signal. For a powerboat running mostly level, this is the range champ.\u003c\/p\u003e\n\u003cp\u003eThe build is straightforward marine gear. White fiberglass radome over brass radiators, capped with a stainless steel ferrule at the base. The fiberglass takes the sun and salt without chalking up fast, and the brass elements inside are what actually do the work of radiating your signal. It threads onto any standard 1-14 inch antenna mount, so it drops right onto the ratchet mounts and rail mounts you already know.\u003c\/p\u003e\n\u003cp\u003eIt ships ready to wire in. You get 20 feet of RG-8X coax already attached, terminated in a PL-259 connector that mates with just about any VHF marine radio. RG-8X is a good middle-ground cable, lower loss than the thin RG-58 you'll find on cheaper antennas, and flexible enough to route through a rigging tube without a fight. If your run to the helm is longer than the 20 feet supplied, you can add a quality low-loss extension. Just keep the total run as short as practical, because every extra foot of cable costs you a little signal.\u003c\/p\u003e\n\u003cp\u003eA word on the install, because a 15-foot antenna asks for a bit more thought than a stubby 3-footer. Up on a hardtop or an arch, that length can whip and vibrate under way, so back it up with a good ratchet mount and, on a fast boat, a support strap or standoff to steady the base. Make sure the mount has clean metal-to-metal contact for a solid ground. A painted arch or a dirty connection is the number one cause of high SWR on an otherwise perfect install, so scuff to bare metal or add a ground strap if your meter reads high. And measure your folded and standing height against any bridges or dock covers before you commit to a spot.\u003c\/p\u003e\n\u003cp\u003eOne maintenance note from the water: down at the ferrule, where the stainless base meets the brass and coax, salt air likes to work its way in over a few seasons. Once a year, pull the connection apart, clean it, hit it with a little dielectric grease, and seal it back up. Do that and this antenna will give you clean, long-range comms for a very long time.\u003c\/p\u003e\n\u003cp\u003eWho should skip it? If you run a small center console or a skiff that stays close to shore, a 15-foot antenna is more than you need and a lot to handle at the ramp. A shorter 3 dB or 6 dB antenna is easier to live with and plenty for inshore work. This one earns its keep when you're pushing well offshore and want to talk to the coast or another boat that's hull-down over the horizon. For that job, the KJM A1591-V is about as much antenna as you can bolt to a boat.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e15.2-foot monopole length for maximum VHF antenna height and reach\u003c\/li\u003e\n  \u003cli\u003e9 dB gain concentrates the signal at the horizon for long-range offshore comms\u003c\/li\u003e\n  \u003cli\u003eWhite fiberglass radome resists UV, salt, and chalking season after season\u003c\/li\u003e\n  \u003cli\u003eBrass radiators handle the radiating work for strong, efficient signal output\u003c\/li\u003e\n  \u003cli\u003eStainless steel ferrule at the base for corrosion resistance where it mounts\u003c\/li\u003e\n  \u003cli\u003eStandard 1-14 inch thread base fits common ratchet and rail antenna mounts\u003c\/li\u003e\n  \u003cli\u003e20 feet of low-loss RG-8X coax included, pre-terminated and ready to route\u003c\/li\u003e\n  \u003cli\u003ePL-259 connector mates with virtually any VHF marine radio\u003c\/li\u003e\n  \u003cli\u003eBest suited to stable powerboat platforms running offshore\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized KJM reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow much range will a 15.2-foot 9 dB antenna give me?\u003c\/summary\u003e\n    \u003cp\u003eVHF is line-of-sight, so range depends mostly on antenna height and gain. A tall 9 dB antenna mounted high on a powerboat can reach other well-equipped boats and coast stations far past the visible horizon, often 20-plus nautical miles boat-to-shore under good conditions. Height and a clean install matter more than anything.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the difference between a 9 dB, 6 dB, and 3 dB antenna?\u003c\/summary\u003e\n    \u003cp\u003eGain describes how tightly the antenna focuses its signal toward the horizon. A 3 dB antenna has a wide, forgiving pattern that's great for small boats that pitch and roll. A 9 dB antenna like this one focuses hard at the horizon for maximum range, but it wants a stable, mostly vertical platform to stay on target. Bigger, steadier powerboats get the most out of 9 dB.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a good antenna for a sailboat?\u003c\/summary\u003e\n    \u003cp\u003eIt can work, but be aware of the tradeoff. A 9 dB antenna has a narrow vertical beam, so when a sailboat heels hard the signal pattern tips off the horizon and you can lose range momentarily. Many sailors run a lower-gain antenna at the masthead for that reason. On a powerboat that stays level, the 9 dB pattern is a big advantage.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat cable and connector come with it?\u003c\/summary\u003e\n    \u003cp\u003eYou get 20 feet of RG-8X coaxial cable already attached, terminated in a standard PL-259 connector. That plugs straight into the antenna jack on virtually any VHF marine radio. RG-8X is a solid low-loss cable, a step up from the thin RG-58 on budget antennas.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need extra support for an antenna this tall?\u003c\/summary\u003e\n    \u003cp\u003eOn a fast boat, yes, it's worth it. A 15-foot whip can whip and vibrate at speed, which stresses the base over time. Use a good ratchet or rail mount and, on a boat that runs hard, add a support strap or standoff to steady it. That keeps the base and the coax connection from fatiguing.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does it thread onto?\u003c\/summary\u003e\n    \u003cp\u003eThe base uses the standard 1-14 inch marine antenna thread, so it fits common ratchet mounts, rail mounts, and standoff mounts. If you already have a 1-14 mount on your boat, this antenna threads right on.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy am I getting high SWR after installing it?\u003c\/summary\u003e\n    \u003cp\u003eThe most common cause is a poor ground at the mount. A painted arch, an anodized rail, or a dirty connection breaks the metal-to-metal contact the antenna needs. Scuff the contact area to bare metal or add a ground strap, and check for a pinched or kinked coax run. Always check SWR with a meter before you seal everything up.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I make the coax run longer than 20 feet?\u003c\/summary\u003e\n    \u003cp\u003eYes. If your radio is more than 20 feet from the mount, add a quality low-loss extension with proper connectors. Just keep the total run as short as you reasonably can, since every extra foot of cable adds a little signal loss at VHF frequencies.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I keep the base connection from corroding?\u003c\/summary\u003e\n    \u003cp\u003eSalt air works into the ferrule joint over a few seasons. Once a year, take the connection apart, clean it up, apply a little dielectric grease, and reseal it. That simple habit keeps corrosion out of the joint and protects your signal for the long haul.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich radio does it work with?\u003c\/summary\u003e\n    \u003cp\u003eAny standard VHF marine radio with a PL-259 antenna jack, which covers just about every fixed-mount unit on the market. The antenna and cable are radio-agnostic, so it pairs with whatever helm radio you're running.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eKJM A1591-V 15.2 Foot 9dB VHF Marine Antenna, White Fiberglass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eKJM\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eA1591-V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e719441101213\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eVHF Marine Radio\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAntenna Type\u003c\/th\u003e\n\u003ctd\u003eMonopole\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd\u003e15.2 Feet\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eGain\u003c\/th\u003e\n\u003ctd\u003e9 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMount Thread\u003c\/th\u003e\n\u003ctd\u003e1-14 Inch Thread Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eWhite Fiberglass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFerrule\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRadiators\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCoaxial Cable\u003c\/th\u003e\n\u003ctd\u003e20 Foot RG-8X\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConnector\u003c\/th\u003e\n\u003ctd\u003ePL-259\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How much range will a 15.2-foot 9 dB antenna give me?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"VHF is line-of-sight, so range depends mostly on antenna height and gain. A tall 9 dB antenna mounted high on a powerboat can reach other well-equipped boats and coast stations far past the visible horizon, often 20-plus nautical miles boat-to-shore under good conditions. Height and a clean install matter more than anything.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the difference between a 9 dB, 6 dB, and 3 dB antenna?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Gain describes how tightly the antenna focuses its signal toward the horizon. A 3 dB antenna has a wide, forgiving pattern that's great for small boats that pitch and roll. A 9 dB antenna like this one focuses hard at the horizon for maximum range, but it wants a stable, mostly vertical platform to stay on target. Bigger, steadier powerboats get the most out of 9 dB.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a good antenna for a sailboat?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It can work, but be aware of the tradeoff. A 9 dB antenna has a narrow vertical beam, so when a sailboat heels hard the signal pattern tips off the horizon and you can lose range momentarily. Many sailors run a lower-gain antenna at the masthead for that reason. On a powerboat that stays level, the 9 dB pattern is a big advantage.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What cable and connector come with it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"You get 20 feet of RG-8X coaxial cable already attached, terminated in a standard PL-259 connector. That plugs straight into the antenna jack on virtually any VHF marine radio. RG-8X is a solid low-loss cable, a step up from the thin RG-58 on budget antennas.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need extra support for an antenna this tall?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"On a fast boat, yes, it's worth it. A 15-foot whip can whip and vibrate at speed, which stresses the base over time. Use a good ratchet or rail mount and, on a boat that runs hard, add a support strap or standoff to steady it. That keeps the base and the coax connection from fatiguing.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does it thread onto?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The base uses the standard 1-14 inch marine antenna thread, so it fits common ratchet mounts, rail mounts, and standoff mounts. If you already have a 1-14 mount on your boat, this antenna threads right on.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why am I getting high SWR after installing it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The most common cause is a poor ground at the mount. A painted arch, an anodized rail, or a dirty connection breaks the metal-to-metal contact the antenna needs. Scuff the contact area to bare metal or add a ground strap, and check for a pinched or kinked coax run. Always check SWR with a meter before you seal everything up.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I make the coax run longer than 20 feet?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. If your radio is more than 20 feet from the mount, add a quality low-loss extension with proper connectors. Just keep the total run as short as you reasonably can, since every extra foot of cable adds a little signal loss at VHF frequencies.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I keep the base connection from corroding?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Salt air works into the ferrule joint over a few seasons. Once a year, take the connection apart, clean it up, apply a little dielectric grease, and reseal it. That simple habit keeps corrosion out of the joint and protects your signal for the long haul.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which radio does it work with?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Any standard VHF marine radio with a PL-259 antenna jack, which covers just about every fixed-mount unit on the market. The antenna and cable are radio-agnostic, so it pairs with whatever helm radio you're running.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"KJM","offers":[{"title":"Default Title","offer_id":44788444332125,"sku":"2007400","price":559.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_2286275f-edc1-4750-992d-eb81932e5285.jpg?v=1785019137","url":"https:\/\/nvnmarine.com\/products\/kjm-a1591-v-9db-vhf-marine-antenna-15-2-ft-white","provider":"NVN Marine","version":"1.0","type":"link"}