[TowerTalk] Fwd: The Need for Grounding

[jimlux]

On 1/14/16 8:49 AM, Kelly Taylor wrote:
> The important thing to remember is electricity doesn’t follow the shortest path somewhere, it follows the path of least resistance. And it’s important to point out that during a lightning event, that path is going to change, as the lightning charge will easily overload a single rod, driving that rod’s resistance sky high. Since the event is not yet over, the remaining charge will follow the next-best path, which could be through your radio. Better it be through the other rods in your network, no?
>
> Is it useful to envision ground rods as resistors, and a chain of ground rods as resistors in parallel?
>
> Since we all know parallel resistors divide current among them, and as a group present a resistance that is some fraction of their individual values, is it a good meme to remind us of the importance of multiple rods?
>

Consider them as inductors in series with resistors.  The inductance is 
about 1 uH/meter.  For 1 MHz, the impedance of a 1uH inductor is 6.28 ohms.