I think folks have pretty much taken care of the base issue. 
I beleive the recommendations for grounding are to use solid wire, not stranded.  If you can, use #2 or larger.  The goal with grounding, if it is for lightning protection, is to get the lowest impedance possible to ground.  Spread the ground rods out as much as you can.  Connect them each to the tower AND to each other.  Pick a point in that that is your ground point and make sure everything connects to that one point.

For more information on grounding, see:
http://www.dslreports.com/forum/remark,13235689~mode=flat~days=9999 Not completely about grounding, but lots of helpful info.
http://www.dslreports.com/forum/remark,13978705 Includes some good diagrams.
http://www.startawisp.com/content/category/8/79/58/ A collection of grounding tips.

Scott Reed
Owner
NewWays
Wireless Networking
Network Design, Installation and Administration
www.nwwnet.net

---------- Original Message -----------
From: Brian Rohrbacher <[EMAIL PROTECTED]>
To: wireless@wispa.org
Sent: Sun, 21 Aug 2005 22:21:37 -0400
Subject: [WISPA] Rohn BX Tower

> I dug a hole 32 inch square by 42 inches deep yesterday for a rohn bx
> tower.  It is 5 sections of 8 ft.  I just got 15 bags of portland cement and will add my own gravel.  
> I was thinking about three 1 1/2 inch pieces of pipe stuck in the concrete to bolt the tower legs to.  I will
> thread and put couplers on the pipe at 22 inches so they can't move.  I've got some re-bar to chuck down in the hole too.
> I've got 3 8ft ground rods and will bond with #4 bare stranded wire.  I picked up a load of grade 8 bolts,
> washers, and lock washers for bolting the tower together and to the pipe stubs.   Anyone have any suggestions
> for me?  This is my first tower.  I will pour tomorrow afternoon.
>
> brian
>
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