[VHFcontesting] [VHF] HD Chimney Bracket

[Art]

You need a tower, not a chimney.

But, I used to live on high ground and had a large VHF tv antenna, a 
large UHF tv antenna, a 2 meter vertical and a 10 element 2 meter 
beam and an HD73 rotor. All of this was on 25 feet of steel pipe and 
was mounted to the chimney with 4 heavy duty chimney brackets (one 
for every foot of chimney above the roof line).

Despite the high winds on the hill top and the relative poor 
condition of the chimney (a block chimney-well aged), those antennas 
stayed up for years! I had the mast guyed with non metallic rayon 
rope on each corner of the house though.

It did finally come down one day when one of the guy ropes broke.

The mast and antennas leaned in one direction due to the bent mast, 
and it did manage to snap the chimney off at the roof line. But all 4 
brackets were still attached to chimney::>

I have no doubt that the antenna and chimney would still be in 
service today if it hadn't been for the guy rope breaking.

Your mileage will vary::>

Art



  mounted on the At 10:54 AM 12/3/2006, you wrote:
>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 at yahoo.com>
> >To: VHF Contesting eMail Remailer <vhfcontesting at contesting.com>,
> >VHF at 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
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