{"id":16127,"date":"2025-12-14T15:34:26","date_gmt":"2025-12-14T10:04:26","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16127"},"modified":"2025-12-14T15:34:28","modified_gmt":"2025-12-14T10:04:28","slug":"what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\/","title":{"rendered":"What is the minimum height for the center and ends of an inverted V antenna for 7135 kHz?"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/JFYvI5TSLxM?si=Laj_hHmW5OsmcBlF\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">The height of your inverted V antenna is crucial because it significantly affects the antenna&#8217;s <strong>radiation pattern<\/strong> (where the signal goes) and its <strong>feedpoint impedance<\/strong> (which affects SWR).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your frequency of 7135 kHz is in the 40-meter band. The wavelength (\u03bb) is approximately:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03bb = 300\/f(MHz) = 300\/7.135 ~ 42 meters<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, <strong>one-half wavelength (\u03bb<\/strong>\/2<strong>) is about 21 meters<\/strong>. This is the <strong>ideal<\/strong> height for the center, but rarely practical for the 40-meter band.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is a breakdown of the suggested heights for the center and ends, along with the trade-offs:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Inverted V Center Height (Apex)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The center of the antenna, where the coax feeds into the wire, should be <strong>as high as you can reasonably get it<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Height Factor (Fraction of \u03bb)<\/strong><\/td><td><strong>Height in Meters (for 7135 kHz)<\/strong><\/td><td><strong>Primary Effect on Performance<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Ideal (<strong>\u03bb<\/strong>\/2)<\/strong><\/td><td>~ 21 meters (69 ft)<\/td><td>Excellent <strong>DX<\/strong> (long-distance) performance with a low take-off angle. Very difficult to achieve in most settings.<\/td><\/tr><tr><td><strong>Good (<strong><strong>\u03bb<\/strong>\/<\/strong>4)<\/strong><\/td><td>~ 10.5 meters (34 ft)<\/td><td>Good <strong>all-around<\/strong> performance. Lower angles for DX are improved compared to lower heights.<\/td><\/tr><tr><td><strong>Minimum (Practical)<\/strong><\/td><td>6 to 8 meters (20 to 26 ft)<\/td><td><strong>Acceptable<\/strong>. Tends to favor <strong>NVIS<\/strong> (Near Vertical Incidence Skywave) for local\/regional contacts (up to about 500 km). This is a common height for 40-meter inverted V installations.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">2. Inverted V End Height<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The height of the ends and the resulting angle are a major advantage of the inverted V, allowing it to fit into smaller spaces.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Minimum End Height:<\/strong> The ends must be kept <strong>out of reach of people and pets<\/strong>, especially since they are energized with RF power. A minimum of 2 to 3 meters (6 to 10 feet) above ground is a common safety and practical minimum.<\/li>\n\n\n\n<li><strong>Optimum Apex Angle:<\/strong> The angle between the two legs at the center (the apex angle) is a key factor.\n<ul class=\"wp-block-list\">\n<li>An angle of <strong>90\u00b0 to 120<\/strong>\u00b0 is generally recommended.<\/li>\n\n\n\n<li>A wider angle (closer to a straight dipole) provides a slightly more directional pattern and higher impedance (closer to 75\u03a9).<\/li>\n\n\n\n<li>A sharper angle (closer to 90<strong>\u00b0<\/strong>) provides a more omnidirectional pattern and a lower feedpoint impedance, often closer to <strong>50\u03a9<\/strong>, which is ideal for matching standard 50\u03a9 coaxial cable without a complex matching network.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>In summary for your 7135 kHz antenna:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Center Apex:<\/strong> Aim for <strong>10.5 meters or higher<\/strong> for best DX, but <strong>6  to  8 meters<\/strong> will still be very effective for regional communication.<\/li>\n\n\n\n<li><strong>Ends:<\/strong> Anchor them <strong>2 to meters<\/strong> off the ground, ensuring the total distance between the ends is manageable for your space while maintaining an apex angle of <strong>90\u00b0 to 120<\/strong>\u00b0.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The height of your inverted V antenna is crucial because it significantly affects the antenna&#8217;s radiation pattern (where the signal goes) and its feedpoint impedance (which affects SWR). Your frequency of 7135 kHz is in the 40-meter band. The wavelength (\u03bb) is approximately: \u03bb = 300\/f(MHz) = 300\/7.135 ~ 42 meters Therefore, one-half wavelength (\u03bb\/2) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16130,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16127","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is the minimum height for the center and ends of an inverted V antenna for 7135 kHz? - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the minimum height for the center and ends of an inverted V antenna for 7135 kHz? - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The height of your inverted V antenna is crucial because it significantly affects the antenna&#8217;s radiation pattern (where the signal goes) and its feedpoint impedance (which affects SWR). Your frequency of 7135 kHz is in the 40-meter band. The wavelength (\u03bb) is approximately: \u03bb = 300\/f(MHz) = 300\/7.135 ~ 42 meters Therefore, one-half wavelength (\u03bb\/2) [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-14T10:04:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-14T10:04:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2025\/12\/What-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-V-antenna-for-7135-kHz.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"677\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"What is the minimum height for the center and ends of an inverted V antenna for 7135 kHz?\",\"datePublished\":\"2025-12-14T10:04:26+00:00\",\"dateModified\":\"2025-12-14T10:04:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\\\/\"},\"wordCount\":405,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/What-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-V-antenna-for-7135-kHz.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/what-is-the-minimum-height-for-the-center-and-ends-of-an-inverted-v-antenna-for-7135-khz\\\/\",\"name\":\"What is the minimum height for the center and ends of an inverted V antenna for 7135 kHz? 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