{"product_id":"the-quiet-loop-mla-30-active-antenna","title":"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp style=\"font-size:16px;line-height:1.85;color:#333;margin:0 0 18px;\"\u003eShort wave listening in a city is a study in noise. Every switching supply, every LED driver and every neighbour's router puts a buzz across the band, and a long wire picks all of it up with the signal. The Quiet Loop is the countermeasure: a small active receive loop covering 500 kHz to 30 MHz, built to sit on a balcony and hear stations that a wire cannot pull out of the hash.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.85;color:#333;margin:0 0 18px;\"\u003eThe physics is the reason it works. A magnetic loop responds to the magnetic component of the field, which falls away faster with distance than the electric component that most local interference is made of. That is where the claimed suppression of up to 30 dB against a long wire comes from, and it is why the loop has a figure-of-eight pattern with two deep nulls: rotate the ring until a noise source sits in a null and it drops away while the station stays. Coverage runs from the medium wave broadcast band up through the amateur and utility bands to 30 MHz, and the loop is directional by design rather than by accident.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.85;color:#333;margin:0 0 18px;\"\u003eMechanically it is small: a 40 gram active element in a rainproof housing, a stainless steel ring, and USB power for the preamplifier, with 220 grams all in for the packed kit. Modular construction means the ring comes apart for storage and goes back together on a balcony rail or a roof without a tower, planning permission or a landlord conversation. One hard rule from the specification, and it matters: this is a receive only antenna, and connecting it to a transmitter will destroy the preamplifier.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.85;color:#555;margin:0 0 6px;\"\u003e\u003cem\u003eThe station was always there. The noise was the problem, and the null is the answer.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr style=\"margin:26px 0;border:0;border-top:1px solid #e8e8e8;\"\u003e\n\u003cdiv class=\"product-features\"\u003e\n\u003ch3 style=\"font-size:19px;color:#1A3A5C;margin:0 0 12px;\"\u003eWhat Makes It Different\u003c\/h3\u003e\n\u003cul style=\"padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:9px 0 9px 26px;position:relative;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#1A3A5C;\"\u003e✦\u003c\/span\u003eActive receive loop covering 500 kHz to 30 MHz without tuning\u003c\/li\u003e\n\u003cli style=\"padding:9px 0 9px 26px;position:relative;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#1A3A5C;\"\u003e✦\u003c\/span\u003eMagnetic pickup, with up to 30 dB rejection of local electrical noise\u003c\/li\u003e\n\u003cli style=\"padding:9px 0 9px 26px;position:relative;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#1A3A5C;\"\u003e✦\u003c\/span\u003eFigure-of-eight pattern with two deep nulls for interference rejection\u003c\/li\u003e\n\u003cli style=\"padding:9px 0 9px 26px;position:relative;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#1A3A5C;\"\u003e✦\u003c\/span\u003eBalcony and roof friendly, no tower or long wire required\u003c\/li\u003e\n\u003cli style=\"padding:9px 0 9px 26px;position:relative;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#1A3A5C;\"\u003e✦\u003c\/span\u003eUSB powered preamplifier, no separate power supply to build\u003c\/li\u003e\n\u003cli style=\"padding:9px 0 9px 26px;position:relative;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#1A3A5C;\"\u003e✦\u003c\/span\u003eStainless steel ring, rainproof housing, modular for storage\u003c\/li\u003e\n\u003cli style=\"padding:9px 0 9px 26px;position:relative;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#1A3A5C;\"\u003e✦\u003c\/span\u003e40 g active element, 220 g packed, receive only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-specs\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:19px;color:#1A3A5C;margin:0 0 12px;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"padding:0;margin:0;\"\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003eFrequency Coverage\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003e500 kHz to 30 MHz\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003eType\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003eActive receive loop, magnetic\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003eNoise Suppression\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003eUp to 30 dB versus a long wire antenna\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003ePattern\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003eFigure-of-eight, two deep nulls\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003ePower\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003eUSB powered preamplifier\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003eRing\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003eStainless steel, modular sections\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003eHousing\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003eRainproof, outdoor rated\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003eProduct Weight\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003e40 g\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003ePackage Weight\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003e220 g, 140 x 130 x 65 mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f0f0f0;list-style:none;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"min-width:150px;flex:0 0 44%;color:#777;\"\u003eTransmit\u003c\/span\u003e\u003cspan style=\"color:#222;font-weight:500;\"\u003eReceive only, never connect a transmitter\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-applications\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:19px;color:#1A3A5C;margin:0 0 12px;\"\u003eWhere It Earns Its Place\u003c\/h3\u003e\n\u003cp style=\"font-size:15px;line-height:1.85;color:#333;margin:0;\"\u003eCity based short wave listeners are the core users, because the loop turns a hopeless balcony into a usable listening post without offending a landlord or a neighbour's television. Amateur radio operators use it as a receive antenna for medium wave and low band work where a transmit antenna is impractical. Utility and numbers station listeners, medium wave DXers chasing transatlantic signals, and anyone in a flat with a metal framed building around them get the same benefit: directivity and noise rejection instead of raw length. It also packs small enough for a hotel window on a trip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-promise\" style=\"margin-top:28px;padding:20px 22px;background:#f7f8fa;border-left:3px solid #1A3A5C;border-radius:4px;\"\u003e\n\u003ch3 style=\"font-size:17px;color:#1A3A5C;margin:0 0 10px;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp style=\"font-size:14.5px;line-height:1.8;color:#444;margin:0;\"\u003eSourced directly from vetted manufacturing partners, inspected before dispatch, and priced without distributor layers. If the item arrives outside specification, we replace it or refund it. Every listing on this store is curated by a human buyer, not bulk-imported and abandoned.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq\" style=\"margin-top:30px;\"\u003e\n\u003ch3 style=\"font-size:19px;color:#1A3A5C;margin:0 0 14px;\"\u003eQuestions Buyers Actually Ask\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom:18px;\"\u003e\n\u003cp style=\"font-size:15px;line-height:1.7;color:#1A3A5C;font-weight:600;margin:0 0 6px;\"\u003eQ: Can I transmit through it?\u003c\/p\u003e\n\u003cp style=\"font-size:15px;line-height:1.8;color:#444;margin:0;\"\u003eNo. This is an active receive antenna and connecting a transmitter will damage the preamplifier immediately. It is for listening only, on any receiver with an antenna input covering the medium and short wave bands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:18px;\"\u003e\n\u003cp style=\"font-size:15px;line-height:1.7;color:#1A3A5C;font-weight:600;margin:0 0 6px;\"\u003eQ: How does it connect to my radio?\u003c\/p\u003e\n\u003cp style=\"font-size:15px;line-height:1.8;color:#444;margin:0;\"\u003eThrough the receiver antenna input, with the preamplifier powered from USB. Any short wave receiver with a standard antenna socket will drive it, from a portable to a desktop set with a coaxial input.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:18px;\"\u003e\n\u003cp style=\"font-size:15px;line-height:1.7;color:#1A3A5C;font-weight:600;margin:0 0 6px;\"\u003eQ: Does it need to be outdoors?\u003c\/p\u003e\n\u003cp style=\"font-size:15px;line-height:1.8;color:#444;margin:0;\"\u003eIt works best outdoors or in a window with a view, since the housing is rainproof and rated for permanent outdoor mounting. Indoors it will still outperform a wire in a noisy building, but a balcony or roof position is where the nulls do their job.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:18px;\"\u003e\n\u003cp style=\"font-size:15px;line-height:1.7;color:#1A3A5C;font-weight:600;margin:0 0 6px;\"\u003eQ: Will it remove all my noise?\u003c\/p\u003e\n\u003cp style=\"font-size:15px;line-height:1.8;color:#444;margin:0;\"\u003eNo, and no antenna will. It rejects the electrical noise that arrives with the electric field, and rotating the ring puts a null on a specific local source. Broadband hash from your own wiring still needs ferrite chokes and a clean power supply to solve properly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:18px;\"\u003e\n\u003cp style=\"font-size:15px;line-height:1.7;color:#1A3A5C;font-weight:600;margin:0 0 6px;\"\u003eQ: How directional is it in practice?\u003c\/p\u003e\n\u003cp style=\"font-size:15px;line-height:1.8;color:#444;margin:0;\"\u003eDeep enough that a slow rotation of the ring is the standard way to kill an interfering LED driver or router while keeping a station. You will find yourself treating the ring as a steering control rather than a fixed antenna.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:18px;\"\u003e\n\u003cp style=\"font-size:15px;line-height:1.7;color:#1A3A5C;font-weight:600;margin:0 0 6px;\"\u003eQ: What do I need to get started?\u003c\/p\u003e\n\u003cp style=\"font-size:15px;line-height:1.8;color:#444;margin:0;\"\u003eThe loop, its preamplifier and a USB power source, plus a receiver. Assembly is a few minutes with no soldering, and the modular ring sections store flat when the antenna comes down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-gallery\" style=\"margin-top:32px;text-align:center;\"\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S5700e2a08dc04e6ebcf99a5fcf4f67273.webp?v=1780276667\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S41ca3a8e004d4710a5b6ea03c6f18998u.webp?v=1780276668\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S7f70693addbc4012824cc10d3428020dw.webp?v=1780276667\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S301f1587483847b2a79f812640f71b156.webp?v=1780276668\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sdfcf12aacd14483ba2a45a327b6f44ddG.webp?v=1780276667\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sc5374d6c4f9e4a36b6e8eb6266e25bbb5.webp?v=1780276667\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S84734ccdd04a4ed184273cf76a782572P.webp?v=1780276668\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S583e2ff158fb4193ac7021bfbca990a7F.webp?v=1780276667\" alt=\"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"The Quiet Loop | MLA-30 Active Receive Antenna, 500 kHz to 30 MHz\",\n  \"description\": \"Short wave listening in a city is a study in noise. Every switching supply, every LED driver and every neighbour's router puts a buzz across the band, and a long wire picks all of \",\n  \"sku\": \"9398477586655\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"EastSupplier\"},\n  \"url\": \"https:\/\/eastsupplier.com\/products\/the-quiet-loop-mla-30-active-antenna\",\n  \"offers\": {\n    \"@type\": \"AggregateOffer\",\n    \"priceCurrency\": \"USD\",\n    \"lowPrice\": \"71.50\",\n    \"highPrice\": \"71.50\",\n    \"offerCount\": \"1\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"url\": \"https:\/\/eastsupplier.com\/products\/the-quiet-loop-mla-30-active-antenna\"\n  },\n  \"aggregateRating\": {\"@type\": \"AggregateRating\", \"ratingValue\": \"4.7\", \"reviewCount\": \"3\"}\n}\n\u003c\/script\u003e","brand":"EastSupplier Platform","offers":[{"title":"black \/ China Mainland","offer_id":49823012978911,"sku":"1005008402606887-black-China Mainland","price":71.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S5700e2a08dc04e6ebcf99a5fcf4f67273.webp?v=1780276667","url":"https:\/\/eastsupplier.co.uk\/de\/products\/the-quiet-loop-mla-30-active-antenna","provider":"EastSupplier Platform","version":"1.0","type":"link"}