{"id":15911,"date":"2026-05-18T16:34:11","date_gmt":"2026-05-18T14:34:11","guid":{"rendered":"https:\/\/nolle.engineering\/?page_id=15911"},"modified":"2026-05-18T22:00:38","modified_gmt":"2026-05-18T20:00:38","slug":"anechoic-test-field","status":"publish","type":"page","link":"https:\/\/nolle.engineering\/en\/antenna-test-facility\/anechoic-test-field\/","title":{"rendered":"Anechoic Test Field"},"content":{"rendered":"<p>The Anechoic Test Field is the measurement volume inside the <a href=\"\/en\/antenna-test-facility\/\">Antenna Test Facility<\/a>. It is built for antenna characterization \u2014 gain, radiation pattern, return loss, axial ratio. Every antenna we manufacture is acceptance-tested here, and customer hardware is measured here during paid campaigns. This page documents the RF layout and the mechanical interface so you can plan what to send.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Layout<\/h2>\n\n\n\n<p>The antenna under test (AUT) sits on a two-axis tracker at the centre of the test field. A wall of pyramidal RF absorbers stands behind it. A linearly polarised standard gain horn sits at the far end of an absorber-lined tunnel, pointing back at the AUT.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Back wall<\/strong> \u2014 absorbers behind the AUT terminate all rearward radiation.<\/li>\n\n\n\n<li><strong>Tracker<\/strong> \u2014 two-axis positioner (azimuth + elevation). The AUT phase centre sits on the intersection of the two rotation axes, so the AUT rotates in place rather than orbiting.<\/li>\n\n\n\n<li><strong>Tunnel<\/strong> \u2014 absorber-lined channel from the AUT plane to the standard gain horn. It sets the receive field of view: anything outside the tunnel mouth is invisible to the horn, and off-axis room reflections strike absorber before they reach it.<\/li>\n\n\n\n<li><strong>Standard gain horn<\/strong> \u2014 fixed at the far end of the tunnel, linearly polarised. Each measurement is two complete sphere sweeps \u2014 one with the horn vertical, one horizontal. Power integrated over the full sphere sets the absolute scale; the vertical and horizontal components combine in post-processing to give the AUT pattern (dBi for linearly polarised AUTs, dBic for circularly polarised) and the axial ratio across the pattern. No separate calibration step required.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-scaled.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"609\" src=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-1024x609.png\" alt=\"\" class=\"wp-image-15919\" srcset=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-1024x609.png 1024w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-300x178.png 300w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-768x456.png 768w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-1536x913.png 1536w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-2048x1217.png 2048w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-18x12.png 18w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-1320x785.png 1320w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_cut-700x416.png 700w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Anechoic Test Field \u2014 layout.<\/figcaption><\/figure>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a0c1422b69ca&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a0c1422b69ca\" class=\"wp-block-image size-large wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-1024x579.png\" alt=\"\" class=\"wp-image-15920\" srcset=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-1024x579.png 1024w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-300x170.png 300w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-768x435.png 768w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-1536x869.png 1536w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-2048x1159.png 2048w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-18x10.png 18w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-1320x747.png 1320w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_3d_view_open_tunnel-700x396.png 700w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewbox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Anechoic Test Field &#8211; 3D view, Tunnel section view<\/figcaption><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-1024x1024.png\" alt=\"\" class=\"wp-image-15924\" style=\"width:382px;height:auto\" srcset=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-1024x1024.png 1024w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-300x300.png 300w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-150x150.png 150w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-768x769.png 768w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-1534x1536.png 1534w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-12x12.png 12w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-360x360.png 360w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-700x701.png 700w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view-100x100.png 100w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_front_view.png 1563w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Anechoic Test Field \u2014 front view.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Absorber specification<\/h2>\n\n\n\n<p>The back wall and the tunnel walls share the same absorber: a carbon-loaded polyurethane pyramidal foam with fire-retardant treatment.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Parameter<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Geometry<\/td><td>Pyramidal, 5&nbsp;\u00d7&nbsp;5 pyramids per 500&nbsp;\u00d7&nbsp;500&nbsp;mm panel<\/td><\/tr><tr><td>Total height<\/td><td>300&nbsp;mm (60&nbsp;mm flat base + 240&nbsp;mm pyramid)<\/td><\/tr><tr><td>Pyramid base<\/td><td>100&nbsp;\u00d7&nbsp;100&nbsp;mm<\/td><\/tr><tr><td>Material<\/td><td>Carbon-loaded polyurethane foam<\/td><\/tr><tr><td>Operating range<\/td><td>80&nbsp;MHz \u2013 100&nbsp;GHz<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Normal-incidence reflectivity, manufacturer&#8217;s published values:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Frequency<\/th><th>Maximum reflectivity<\/th><\/tr><\/thead><tbody><tr><td>1&nbsp;GHz<\/td><td>\u221215&nbsp;dB<\/td><\/tr><tr><td>1.5&nbsp;GHz<\/td><td>\u221228&nbsp;dB<\/td><\/tr><tr><td>3&nbsp;GHz<\/td><td>\u221238&nbsp;dB<\/td><\/tr><tr><td>5&nbsp;GHz<\/td><td>\u221245&nbsp;dB<\/td><\/tr><tr><td>10&nbsp;GHz<\/td><td>\u221250&nbsp;dB<\/td><\/tr><tr><td>15&nbsp;GHz<\/td><td>\u221250&nbsp;dB<\/td><\/tr><tr><td>40&nbsp;GHz<\/td><td>\u221250&nbsp;dB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Antenna mount and tracker interface<\/h2>\n\n\n\n<p>The AUT mounts to a 3D-printed C-bracket carried by the tracker. The bracket rotates about the elevation axis at one end and about the azimuth axis at the other; this places the AUT phase centre on the intersection of the two rotation axes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"796\" src=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-1024x796.png\" alt=\"CAD render of the 3D-printed C-bracket mounted on the tracker, with an antenna visible in the centre aperture and pyramidal absorbers in the background.\" class=\"wp-image-15907\" srcset=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-1024x796.png 1024w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-300x233.png 300w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-768x597.png 768w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-1536x1194.png 1536w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-15x12.png 15w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-1320x1026.png 1320w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount-700x544.png 700w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/atf_mount.png 1980w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">C-bracket on the tracker. The two outer wheels are the elevation and azimuth axes.<\/figcaption><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-1024x576.jpg\" alt=\"Photo of the C-bracket installed in the Anechoic Test Field with an antenna mounted in the centre aperture and the SMA feedline dropping out of the underside.\" class=\"wp-image-15908\" style=\"width:608px;height:auto\" srcset=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-1024x576.jpg 1024w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-300x169.jpg 300w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-768x432.jpg 768w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-1536x864.jpg 1536w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-2048x1152.jpg 2048w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-18x10.jpg 18w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-1320x743.jpg 1320w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/PXL_20260518_093028229-700x394.jpg 700w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Bracket in service. The AUT mounts in the centre aperture; an SMA pigtail drops out of the underside.<\/figcaption><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband.pdf\" target=\"_blank\" rel=\"noopener\" download><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"791\" src=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-1024x791.png\" alt=\"Multi-view technical drawing of the L-Band variant of the antenna interface bracket, with elevation and azimuth axes labelled and dimensions in millimetres.\" class=\"wp-image-15910\" srcset=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-1024x791.png 1024w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-300x232.png 300w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-768x593.png 768w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-1536x1187.png 1536w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-2048x1583.png 2048w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-16x12.png 16w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-1320x1020.png 1320w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_mount_lband-700x541.png 700w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Antenna interface bracket \u2014 L-Band variant (click for the PDF drawing). Hole pattern and connector position are common across bracket variants; outer envelope and aperture diameters change to suit the antenna family.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Mechanical envelope<\/h2>\n\n\n\n<p>Before sending an antenna for measurement, confirm the following against your design:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Maximum AUT envelope<\/strong> \u2014 the swept-volume envelope that fits between the bracket arms and clears the tunnel mouth during a full sphere sweep is shown below and supplied as a STEP model alongside the bracket interface (<a href=\"#adapter-design-files\">Adapter design files<\/a>).<\/li>\n\n\n\n<li><strong>Maximum mass \/ inertia<\/strong> \u2014 validated for an L-Band helix baseline: 650&nbsp;g total, 0.068&nbsp;kg\u00b7m\u00b2 about the elevation axis. Higher on request.<\/li>\n\n\n\n<li><strong>Mounting interface<\/strong> \u2014 bolt-circle and pin pattern per the bracket drawing above.<\/li>\n\n\n\n<li><strong>RF interface<\/strong> \u2014 SMA on the bracket. Adapters available for other connector families; specify in the booking.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1500\" height=\"1496\" src=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy.png\" alt=\"Bracket and the swept-volume envelope of the maximum AUT that fits in the tracker during a full sphere sweep, shown in assembled view.\" class=\"wp-image-15935\" style=\"aspect-ratio:1.002682691275888;width:464px;height:auto\" srcset=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy.png 1500w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-300x300.png 300w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-1024x1021.png 1024w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-150x150.png 150w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-768x766.png 768w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-12x12.png 12w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-1320x1316.png 1320w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-360x360.png 360w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-700x698.png 700w, https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_assy-100x100.png 100w\" sizes=\"auto, (max-width: 1500px) 100vw, 1500px\" \/><\/a><figcaption class=\"wp-element-caption\">Bracket with the maximum AUT envelope \u2014 the swept volume a payload must stay within to clear the tunnel mouth during a full sphere sweep.<\/figcaption><\/figure>\n<\/div>\n\n\n<p>RF parameters \u2014 frequency coverage, polarization handling, dynamic range, achievable pattern resolution \u2014 live on the <a href=\"\/en\/antenna-test-facility\/\">Antenna Test Facility page<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"adapter-design-files\">Adapter design files<\/h2>\n\n\n\n<p>One STEP file contains two objects: the standard mounting bracket interface and the maximum AUT mechanical envelope. Use the bracket as the reference geometry when designing an adapter for an antenna that does not match an existing bracket variant, and use the envelope to verify your antenna fits inside the swept volume.<\/p>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-15936\" href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_step.zip\">antenna_envelope.step (zipped \u2014 bracket + max AUT envelope)<\/a><a href=\"https:\/\/nolle.engineering\/wp-content\/uploads\/2026\/05\/antenna_envelope_step.zip\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-15936\">Download<\/a><\/div>\n\n\n\n<div class=\"wp-block-group info-box\" style=\"border-radius:6px;background-color:#f0f4f8;padding:1.5rem\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n\n<p><strong>Need a custom adapter?<\/strong> Share the antenna footprint and we can design and print the adapter as part of the booking. <a href=\"mailto:info@nolle.engineering\">Talk to us<\/a>.<\/p>\n\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>The Anechoic Test Field is the measurement volume inside the Antenna Test Facility. It is built for antenna characterization \u2014 gain, radiation pattern, return loss, axial ratio. Every antenna we manufacture is acceptance-tested here, and customer hardware is measured here during paid campaigns. This page documents the RF layout and the mechanical interface so you&#8230; <\/p>\n<div class=\"link-more\"><a href=\"https:\/\/nolle.engineering\/en\/antenna-test-facility\/anechoic-test-field\/\">Read More<\/a><\/div>","protected":false},"author":2,"featured_media":15925,"parent":13993,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-15911","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Anechoic Test Field - nolle.engineering<\/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:\/\/nolle.engineering\/en\/antenna-test-facility\/anechoic-test-field\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Anechoic Test Field - nolle.engineering\" \/>\n<meta property=\"og:description\" content=\"The Anechoic Test Field is the measurement volume inside the Antenna Test Facility. 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