[TowerTalk] TowerTalk Digest, Vol 41, Issue 21

[Robin Midgett]

Yes, I can tell you...No, absolutely not! 25G isn't self-supporting 
at any height. Additionally, if you were to erect this 40' tower 
without guying it, someone would have to climb it and install the 
antenna...making for a very dangerous situation. The ice loading 
situation that someone else mentioned is another reason not to do this.
Granted, hams have used this technique and gotten away with it for 
years...but that doesn't justify doing it. You should either guy the 
25G installation or use self-supporting tower.


At 05:32 AM 5/10/2006, you wrote:
> > -----Original Message-----
> > From: towertalk-bounces at contesting.com
> > [mailto:towertalk-bounces at contesting.com] On Behalf Of Martin
> > & Ann Mein
> > Sent: Monday, May 08, 2006 8:37 PM
> > To: Towertalk at contesting.com
> > Subject: [TowerTalk] self-supporting rohn 25g??
> >
> >
> > Hi all,
> > Can anyone tell me if it's OK to install a 40' tower, made from 
> four 10-foot sections of Rohn 25G, as a self-suppoting
> > tower?  The antenna that wpould be on the tower is a small 
> omni-directional circularly-polarized FM antenna for 95.9
> > MHZ, so it is small with not much windload.  How big does the 
> cement base have to be?  Locally, the minimum concrete order
> > is 4 yards.  We are located in upstate NY.  4 yards would be 
> somewhere around a 4.5' X 4.5' X 5.5' foot base.
> > Thanks and 73...
> > Jeff KP3FT
> > Spirit And Truth Christian Radio  WJIH-LP  95.9

Thanks,
Robin Midgett K4IDC
615-322-5836 office - rolls to pager
615-835-7699 pager
615-301-1642 home
K4IDC at comcast.net
http://www.people.vanderbilt.edu/~robin.midgett/index.htm