Here's a fairly good article on it...
http://www.iwaponline.com/nh/026/0125/0260125.pdf
73!
-Adam
On 5/13/2011 10:42 AM, K7LXC@aol.com wrote:
> In a message dated 5/13/2011 6:55:21 A.M. Pacific Daylight Time,
> towertalk-request@contesting.com writes:
>
> > My 40 HDBX has closer to 6 yards under it. It's a block 6.5
> square, 6 ft
> deep. The old Rohn drawings specified a 4' deep hole. I also have a yard
> of gravel in the bottom of the hole to prevent ice lensing.
>
> What's ice lensing? I couldn't find it in my dictionary. Tnx.
>
> Cheers,
> Steve K7LXC
>
>
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