The Rohn recommended foundation is 4'x4'x4' (3.5' below ground) for 25G
freestanding towers. However, according to the 2004 Rohn catalog, 40' of
freestanding 25G is only rated for 1.5 sq. ft. of antenna at 70 MPH,
assuming no ice. It won't even support itself at 80 MPH and above. For
what you're trying to do, Rohn 55 is probably marginal, and then you would
need a 6'x6'x4' foundation.
73,
Clay W7CE
----- Original Message -----
From: "Tom Horton" <k5iid@sbcglobal.net>
To: "Tower Talk" <towertalk@contesting.com>
Sent: Thursday, August 20, 2009 10:56 AM
Subject: [TowerTalk] How much?
I am very sure this has been done several if not many times...but...
How much cement do I really need to install my 40 foot Rohn 25 with a two
element Cubex quad and make it freestanding.
I have a 3x3x3 foot hole, but I seriously doubt that it needs to be full...
or does it?
Thanks
Tom K5IID
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