John:
Maybe it is not omni-directional.
Since the satellites don't go further north than about 55 degrees, then
(as long as you are in the northern hemisphere) you could reject both
reflections and also any direct signal low on the northern horizon.
--- Graham
==
On 4/3/2011 7:42 PM, John Ackermann N8UR wrote:
A couple of years ago I picked up a surplus Aeroantenna choke-ring GPS
antenna that I think was intended for surveying use. I finally got it
installed today and noticed that it has an arrow on the bottom
indicating that the antenna should be oriented with the arrow facing
north.
I'm trying to figure out why an omnidirectional antenna should care
about which way it is oriented. The best I can figure is that perhaps
it is for repeatability in surveying, so that any minor offset in the
phase center would remain consistent when moving the antenna from site
to site.
Does anyone have a better answer?
John
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