On Thu, 04 Jun 2009 06:29:27 -0400, Wizard of Woodstock
wrote:

When I had my towers, I went through a whole bunch of gas discharge
connectors one summer and finally had New England Tower come over
and completely redo the ground system - buried a lot of #10 copper
wire in a grid, staked with 8 foot ground rods and each leg of each
tower was hard bonded to the grid. That helped a lot - the number of
strikes the following year went down significantly.

Don't ask me why.

I believe there's a theory that a good grounding system will bleed off
accumulated charge before the voltage gets high enough to initiate a
leader stroke.