In message 
<off8e52428.13da4ea9-on882573dc.00055109-882573dc.0007d...@slpower.com>, 
dated Fri, 25 Jan 2008, [email protected] writes:

>You no longer have reflections off the top of the table, but you have 
>higher capacitance through the 80cm of foam to ground, affecting your 
>measurements in a different way..

The capacitance is approximately doubled, but it's twice very little, 
with a dielectric thickness of 0.8 m.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
For very important information, please turn over.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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