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The important bit about those graphs is the 10-15 degree ToA angle as statistically that's the one thats going to be around the most common angle of arrival for signals up to around 7000 miles. Even at 17' you have 5dBi of gain at 10 degrees take off and whilst that is 5dBi less than it is at 36' it'll still give you more gain over a vertical.

However what is more important than absolute forward gain is the ability to null out signals that you don't want. If you're trying to talk to someone in Europe the problem you have with a vertical is that you get to hear everyone in the USA which makes working Europe a lot harder. Because of the nature of the antenna, signals coming in from the rear and the sides are massively attenuated making it easier to hear what you're actually wanting to work.

So whilst 36' would be great if you can get it up there, its still worth putting up at 17'.

<blockquote data-quote="M0GVZ" data-source="post: 476664" data-attributes="member: 22312">The important bit about those graphs is the 10-15 degree ToA angle as statistically that&#039;s the one thats going to be around the most common angle of arrival for signals up to around 7000 miles. Even at 17&#039; you have 5dBi of gain at 10 degrees take off and whilst that is 5dBi less than it is at 36&#039; it&#039;ll still give you more gain over a vertical.However what is more important than absolute forward gain is the ability to null out signals that you don&#039;t want. If you&#039;re trying to talk to someone in Europe the problem you have with a vertical is that you get to hear everyone in the USA which makes working Europe a lot harder. Because of the nature of the antenna, signals coming in from the rear and the sides are massively attenuated making it easier to hear what you&#039;re actually wanting to work.So whilst 36&#039; would be great if you can get it up there, its still worth putting up at 17&#039;.</blockquote>

[QUOTE="M0GVZ, post: 476664, member: 22312"] The important bit about those graphs is the 10-15 degree ToA angle as statistically that's the one thats going to be around the most common angle of arrival for signals up to around 7000 miles. Even at 17' you have 5dBi of gain at 10 degrees take off and whilst that is 5dBi less than it is at 36' it'll still give you more gain over a vertical. However what is more important than absolute forward gain is the ability to null out signals that you don't want. If you're trying to talk to someone in Europe the problem you have with a vertical is that you get to hear everyone in the USA which makes working Europe a lot harder. Because of the nature of the antenna, signals coming in from the rear and the sides are massively attenuated making it easier to hear what you're actually wanting to work. So whilst 36' would be great if you can get it up there, its still worth putting up at 17'. [/QUOTE]

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