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Old Oct 13, 2008, 03:55 PM
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Winchester; Ohio
Joined Feb 2001
876 Posts
Im a licensed ham, just dont get on the air like I used to. From what I remember about antenna theory when you start increasing the gain on antenna's your effectivly taking the signal away from one part of the radiation pattern and focusing it on another part.

Similar to focusing a light beam.

To help visualise the patterns, for example on the horizontal patterns imagine if you were looking straight down(or up) at your plane. The radiation pattern would be pretty equal in all directions (if your antenna was vertical) in a horizontal pattern.

For the vertical patterns imagine if your aircraft was out on front of you and the radiation pattern would be in the vertical plane, above and below the aircraft.

With a perfect omnidirectional pattern you would end up with something close to a donut shape. Signal emitting equally in all direction.

Seems like for the application here something with a little more of "downward" pattern might get youy a little more range??
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