On Wednesday, December 31, 2014 2:48:18 PM UTC-6, gareth wrote:
In the textbooks, a capacity hat is shown as having a capacity down
to ground (in the case of a marconi antenna), but if you do the calculations
based on the physical dimensions, the resulting capacitance is so small
as to be meaningless.

So, .... what is the real picture here?

Abraham Lincoln often wore a large capacity hat. :/