{"product_id":"four-arm-spiral-antennas-9780890063484","title":"Four-Arm Spiral Antennas","description":"Explains in detail the underlying principles of four-arm spiral direction-finding antennas for those who wish to design such systems. Includes performance results and practical aspects for the first-time designer. For all models, and for symmetrical and simplified variations, discusses mode forming,\u003cbr\u003e","brand":"Artech House Publishers","offers":[{"title":"Default Title","offer_id":50414222704914,"sku":"9780890063484","price":133.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/4771\/8930\/files\/img_2fc6ad04-0395-4398-99a7-ccba62dd753d.jpg?v=1729362584","url":"https:\/\/surprise-castle.myshopify.com\/products\/four-arm-spiral-antennas-9780890063484","provider":"Surprise Castle","version":"1.0","type":"link"}