<br><font size=2>Hi,</font>
<br>
<br>
<br><font size=2>> Vertcal bounced becomes Horizontal, Right Circular
becomes Left Circular etc</font>
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<br>
<br><font size=2 face="sans-serif">Hmmmm, Not quite true. Wave
theory shows that a wave front reflected of a perpendicular </font>
<br><font size=2 face="sans-serif">plane will simply mirror itself, it
will flip but not by 90 degrees but 180 degrees.</font>
<br>
<br><font size=2 face="sans-serif">This is what causes distructive reasonance,
ie the inverted phase. </font>
<br>
<br><font size=2 face="sans-serif">It is when the wavefront interacts with
the reflection surface at "angles" other than 0 degrees that
</font>
<br><font size=2 face="sans-serif">interferance patterns are set up.</font>
<br>
<br><font size=2 face="sans-serif">However, it has been seen that ionospheric
reflection of a radio wave can result in a degree of </font>
<br><font size=2 face="sans-serif">faraday rotation which is not really
reflection per see but H plane interaction of the wave with a magnetic
field.</font>
<br>
<br><font size=2 face="sans-serif">At best, firing a 2.4 Ghz signal a a
flat plane "survey marker" (as the original message was about)
from probably</font>
<br><font size=2 face="sans-serif">not only a horizontal angle but also
some angle with a vertical component would result in all sorts of
reflected waves</font>
<br><font size=2 face="sans-serif">being seen and probably not much of
a useful signal. Most probably contributed to the small size of such
a surface.</font>
<br><font size=2 face="sans-serif">A larger surface area of many 10's of
wavelengths would have better results.</font>
<br>
<br><font size=2 face="sans-serif">I have known of Ham Radio Operators
reflecting their 10 GHz signals off of water towers to get around</font>
<br><font size=2 face="sans-serif">hills and it works quite well.</font>
<br>
<br><font size=2 face="sans-serif">So anything is possible! </font>
<br>
<br><font size=2 face="sans-serif">Regards</font>
<br>
<br><font size=2 face="sans-serif">Mark</font>
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