"ve2pid" wrote in message
...
The context is this: We are discuting about capacitance hats.. It
seems that the name is confusing, since it adds inductance instead of
capacitance to an antenna.

So, since a solid disk adds inductance (the resonnant freq of the
antenna drops), we are looking for a formula to evaluate that
inductance (and then inductive reactance)..

BTW, why don't we use the name 'inductive hat'...??

adding capacitance also lowers the resonant frequency. remember, the
capacitive hat is not adding capacitance in series with the feedpoint, it is
adding to the self capacitance and capacitance to the ground.