[Antennas] Need good idea for chimney mount.

Mon, 13 Oct 2003 18:02:58 -0500

I'm a retired licensed Chicago mason contractor.

A lot depends on the use of the chimney.
(A Service Chimney is one that exhausts the hot gases of a furnace and or
water heater. It usually has a 8 or 10" round hard fired clay pipe sticking
up out of the top of the chimney.)
(A Fireplace Chimney is for a wood or gaslog burning fireplace. It usually
has a rectangular clay flue liner sticking up out of the top of the chimney)

A service chimney or fireplace is usually about ~21" square.
Both types of chimneys can be incorporated into a single unit, in which it
is approx. 60" X 21" or more if the house requires even more fireplaces or
furnaces.

A single service chimney should not be used to support anything bigger than
a TV antenna.

I made money repairing me, trust me on this...

PS. A gas log fireplace will exhaust corrosive gases also. Just not in the
same quantity as a gas burning furnace. If unused and even with the damper
closed, warm air will still escape the chimney and could condense and freeze
on a rotor that is above the flue.

A wood burning fireplace will exhaust tar and soot that will coat anything
above the flue with a greasy dark messy uncleanable creosote.

I made money cleaning this, trust me on this...

----- Original Message ----- 
From: "Jim Isbell" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Monday, October 13, 2003 5:41 PM
Subject: Re: [Antennas] Need good idea for chimney mount.

> Well, we dont use the fireplace.  It doesn't get that cold here. So
> chimney gases are not a concern.   As to the wind load, a 3 band spider
> beam weighs less than 20 lb. and can be turned by a standard TV antenna
> rotor so the wind load is negligible.  The reason I went for a spider
> beam is because we have a hurricane or two here almost every year.  The
> chimney is exceedingly strong and I think the pole would bend in the
> middle before anything on the chimney was even stressed.
>
> [email protected] wrote:
>
> >I strongly  recommend against mounting anything on a chimney.
> >
> >1. Its not good for the chimeny to have any substantial wind moments on
it.
> >
> >2.  Ever notice what happens to metals subjected to the corrosive action
of
> >chimney flue gasses after just a few months?...it will damage  your
antenna's
> > support,  feedline  and the antenna itself.
> >
> >Bob
> >
> >
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