For that kind of wind loading, you need a tower. Your chimney will break
off in 50 mph winds otherwise. Concrete is strong under compression but
weak under tension. Anything bigger than a TV antenna on a chimney is
asking for trouble.
Go here, type in chimney and do some reading if you aren't convinced:
http://lists.contesting.com/archives//html/Towertalk/
-Russ KB8U
>From: Ev Tupis <w2ev@yahoo.com>
>To: VHF Contesting eMail Remailer <vhfcontesting@contesting.com>,
>VHF@w6yx.stanford.edu
>Subject: [VHF] HD Chimney Bracket
>Date: Fri, 1 Dec 2006 10:59:13 -0800 (PST)
>
>I have a modern (13-year old) masonary chimney that has been asking to be
>dressed up a little. Does anyone have a recommendation as to the "Heaviest
>Duty" antenna chimney mount that is available for retail purchase? I'd
>like to mount a 4' mesh dish, and a couple 30' yagi's (222 and 432 MHz).
>
>Ev W2EV
>Everyone is raving about the all-new Yahoo! Mail beta.
>http://new.mail.yahoo.com
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