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[TowerTalk] Super high antennas on 10 to 20

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Subject: [TowerTalk] Super high antennas on 10 to 20
From: (Pete Smith)
Date: Sat, 02 Feb 2002 07:53:37 -0500
At 09:13 PM 2/1/02 -0500, Chuck wrote:
>In getting back to the basics, I submit that at heights over 4 to 6
>wavelengths above ground, the antenna is in "free space" and 
>that's why the "nulls"are filled in. Also, at these heights, in free space 
>means you have no gain from ground reflection, so they are 5-6 db
>down from lower antennas.  How does one define free space?  How
>high above ground would you have to be to be considered in this category?

A lot higher than 4-6 wavelengths.  I ran a 10m yagi in EZNEC at 200 feet
above ground, and both the deep nulls and reflection gain were still fully

73, Pete N4ZR

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