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Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!tgr!price%marlin@Nosc
From: price%marlin@Nosc (James N. Price)
Newsgroups: net.ham-radio
Subject: Re: Roof Mounting a Beam Antenna
Message-ID: <211@brl-tgr.ARPA>
Date: Fri, 26-Jul-85 17:52:19 EDT
Article-I.D.: brl-tgr.211
Posted: Fri Jul 26 17:52:19 1985
Date-Received: Sun, 28-Jul-85 08:06:49 EDT
Sender: news@brl-tgr.ARPA
Lines: 30

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Bruce--I have a pseudo-roof mounted beam, and I went thru the
same drill and quandries about what to do.  What I elected to do,
somewhat due to simplicity, somewhat due to geometry, was to use
a 30' telescoping TV mast alongside the house.  The mast is
drilled thru the eaves of the house, thus allowing it to be well 
secured at that point as well as easy to pull up while standing on
the roof.  It's easy to mount the antenna, too, because all work can
be done at eye level on the roof vice on ladders.

If you opt for an actual roof mount, I suggest a triangular tower
section with a tilt-over base, again for the sake of mounting the
antenna and raising it.  You WILL need to bolt the tower section 
THRU your roof, which can be a problem for some houses (like ours
which has open beam ceilings thruout!).  And you will need to guy
it well since you don't want the antenna to take your roof off in
a good wind!  And remember about using non-resonant lengths of guy
wires.

I have a TH-3JRS which is no big shakes as a beam, but it beats the
heck out of dipoles and verticals!  I wouldn't advise roof-mounting
an antenna too much bigger than that--the wind load is really    
incredible, even on the smaller beams.

Hope that helps.  73--

Jim Price, K6ZH, San Diego, CA
(619) 225-2665
PRICE@NOSC.ARPA
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