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One advantage to stacking them, one at half wavelength and one at one wavelength high for example is the ability to switch between them to give you better contacts at varying distances. For example the one at a wavelength high is going to be worse for nearer contacts than the one at half a wavelength high

If we look at the chart below for elevation angles and arrival angles above 18 degrees the half wavelength high starts to win, becoming at 30 degrees (close signals within a few hundreds to a thousand miles) nearly 20dB better. During contesting I've been in the position of having to lower my antenna because at 60ft high I couldn't hear let alone work anything under 2500 miles away.

<blockquote data-quote="M0GVZ" data-source="post: 665959" data-attributes="member: 22312">One advantage to stacking them, one at half wavelength and one at one wavelength high for example is the ability to switch between them to give you better contacts at varying distances. For example the one at a wavelength high is going to be worse for nearer contacts than the one at half a wavelength highIf we look at the chart below for elevation angles and arrival angles above 18 degrees the half wavelength high starts to win, becoming at 30 degrees (close signals within a few hundreds to a thousand miles) nearly 20dB better. During contesting I&#039;ve been in the position of having to lower my antenna because at 60ft high I couldn&#039;t hear let alone work anything under 2500 miles away. <img src="http://www.karinya.net/g3txq/temp/angle_of_arrival_stats/aoa_dipole_elevations.png" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></blockquote>

[QUOTE="M0GVZ, post: 665959, member: 22312"] One advantage to stacking them, one at half wavelength and one at one wavelength high for example is the ability to switch between them to give you better contacts at varying distances. For example the one at a wavelength high is going to be worse for nearer contacts than the one at half a wavelength high If we look at the chart below for elevation angles and arrival angles above 18 degrees the half wavelength high starts to win, becoming at 30 degrees (close signals within a few hundreds to a thousand miles) nearly 20dB better. During contesting I've been in the position of having to lower my antenna because at 60ft high I couldn't hear let alone work anything under 2500 miles away. [IMG]http://www.karinya.net/g3txq/temp/angle_of_arrival_stats/aoa_dipole_elevations.png[/IMG] [/QUOTE]

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