https://wiki.simtx.net/index.php?action=history&feed=atom&title=Vertical_Antenna 2026-07-29T07:31:34Z Revision history for this page on the wiki MediaWiki 1.43.9 https://wiki.simtx.net/index.php?title=Vertical_Antenna&diff=36&oldid=prev 2026-07-05T08:54:38Z

<p>Trim modelling internals, keep configuration facts</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 08:54, 5 July 2026</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The &#039;&#039;&#039;vertical&#039;&#039;&#039; is a quarter-wave monopole worked against ground. It is omnidirectional and radiates well at low elevation angles, which favours distance.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The &#039;&#039;&#039;vertical&#039;&#039;&#039; is a quarter-wave monopole worked against ground. It is omnidirectional and radiates well at low elevation angles, which favours distance.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>== <del style="font-weight: bold; text-decoration: none;">Geometry in SimTX </del>==</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>== <ins style="font-weight: bold; text-decoration: none;">Configuration </ins>==</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>A single vertical radiator fed at the base <del style="font-weight: bold; text-decoration: none;">against the ground</del>. The element length defaults to 5.1 m; a length of 0 selects a resonant quarter-wave element for the operating frequency. The azimuth field is disabled because the pattern is <del style="font-weight: bold; text-decoration: none;">symmetric. The height field influences </del>the <del style="font-weight: bold; text-decoration: none;">surrounding path geometry rather than the radiator length</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>A single vertical radiator fed at the base. The element length defaults to 5.1 m; a length of 0 selects a resonant quarter-wave element for the operating frequency. The azimuth field is disabled because the pattern is the <ins style="font-weight: bold; text-decoration: none;">same in all directions</ins>.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Characteristics ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Characteristics ==</div></td></tr> <!-- diff cache key simtxwiki:diff:1.41:old-16:rev-36:php=table --> </table>

Clanker https://wiki.simtx.net/index.php?title=Vertical_Antenna&diff=16&oldid=prev 2026-07-05T08:45:20Z

<p>Create vertical page</p> <p><b>New page</b></p><div>The &#039;&#039;&#039;vertical&#039;&#039;&#039; is a quarter-wave monopole worked against ground. It is omnidirectional and radiates well at low elevation angles, which favours distance.<br /> <br /> == Geometry in SimTX ==<br /> A single vertical radiator fed at the base against the ground. The element length defaults to 5.1 m; a length of 0 selects a resonant quarter-wave element for the operating frequency. The azimuth field is disabled because the pattern is symmetric. The height field influences the surrounding path geometry rather than the radiator length.<br /> <br /> == Characteristics ==<br /> * Typical gain around 1.8 dBi, evenly in all compass directions.<br /> * Low typical takeoff angle around 18 degrees: good for long-distance ionospheric paths despite the modest gain figure.<br /> * Vertical polarization, which is strongly favoured on short-range ground-hugging paths. For local and regional coverage below a few hundred kilometers on the lower bands, a vertical often outperforms much &quot;bigger&quot; horizontal antennas.<br /> * Ground quality matters more than for horizontal antennas; poor ground raises losses.<br /> <br /> == Sizing ==<br /> A resonant quarter-wave element in meters is approximately 71.5 divided by the frequency in MHz, half the dipole length (see [[Antenna Calculations]]). Example: about 10 m at 7.1 MHz.<br /> <br /> == When to use ==<br /> Pick the vertical for omnidirectional low-angle coverage, groundwave range on the low bands, or when there is no room for long horizontal wires. Its weakness is medium-range ionospheric coverage, where high-angle radiators (dipole, inverted-V, loop) do better.<br /> <br /> [[Category:Antennas]]</div>

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