Illustration of ILS localizer and glideslope emissions.
<a href="//commons.wikimedia.org/wiki/User:Fred_the_Oyster" title="User:Fred the Oyster">Fred the Oyster</a>
<a href="//commons.wikimedia.org/wiki/File:ILS_illustration.jpg" class="image"><img alt="ILS illustration.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/ILS_illustration.jpg/100px-ILS_illustration.jpg" decoding="async" width="100" height="104" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/ILS_illustration.jpg/150px-ILS_illustration.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/ILS_illustration.jpg/200px-ILS_illustration.jpg 2x" data-file-width="600" data-file-height="622"></a>