I've seen some really weird ideas of this (like taking a 100' Jesus statue on a mountain in Spain and putting a lightning rod in his right hand), But it seems it work as the local church hasn't complained about their TV interference.
Here's the opposite:http://www.youtube.com/watch?v=H5wr1Ishmx0
The rounded surface of the Van der Graaf Generator does the same thing to build and contain the static charge.
It seems if we lived on a needle shaped planet, we'd never have to worry about electrical issues building up on a globe....
(Edited: Yikes, what about the 'bob' anti turtle devices on the Hobie Cats? That could be a nasty if physics does it's nasty stuff in a lightening storm?)