[TowerTalk] Free standing tower advice needed

K7LXC at aol.com K7LXC at aol.com
Mon Mar 20 09:49:32 EST 2006

In a message dated 3/15/2006 1:03:33 P.M. Pacific Standard Time,  
towertalk-request at contesting.com writes:

>  We have an opportunity at WP2Z to put up another tower. The  owner of the
house would like it to be free standing. We would like to put  up a 70' tower
so we could raise the height of the 40M beam (Cushcraft  402CD is presently
at 35'). Also it would give us a higher support for 80  and 160M wire
antennas. The only experience I have had with free standing  towers is the
35' aluminum Universal tower that is holding a C3E. It used  to be 45' high
till a hurricane several years ago came along and ripped off  the top 10'
along with the tribander and rotor and proceeded to deposit it  in small
pieces a few hundred yards away.
>  WP2Z is at 900' -  one of the highest points on the island. And we are on
solid rock. So it  will be fun to get a base dug. This QTH gets high winds a
lot. We have  trouble keeping any kind of tribander on the one tower due to
the high  updraft that occurs almost every night. The new tower will be about
100'  away where the updraft doesn't typically occur.

    You don't have to excavate for the base if it is  solid rock - that'd be 
a waste of time since you're just going to fill it back  up again with 
concrete. Drill some holes for the anchor bolts with coring bits  and then either 
epoxy in the anchor bolts or use rock expansion bolts. Both  have plenty of 

>  My questions to the group  are:
>  - Am I foolish to try to put up a 70' free standing tower  at such a
    Why would it be foolish? It's just another tower  - you can't have too 
many of those - hi. 
    If you're worried about the wind, just build it  hell-for-stout realizing 
that there is some pretty good wind exposure which  you're subject too 

>  - If not what's recommended for this kind of environment  especially being 
close to salt water? I was looking at Universal Towers  HD21-70, Trylon
T500-72, T400-72, AN Wireless HD-70. Are these overkill or  fine or

        The Trylon is a pretty good  value for a medium-duty tower - it'll 
take 6 square feet @ 100 MPH. The AN  towers are pretty strong - and 
commensurately expensive. I'm personally  not a fan of aluminum towers since they are NOT 
commercial grade. 
    If saltwater is a problem, I'd put another finish  on the tower in 
addition to the galvanizing. They make industrial epoxies that  do a real good job 
of sealing them up. 
Steve    K7LXC
Professional tower services for amateurs &
Champion Radio Products
_www.championradio.com_ (http://www.championradio.com) 
Cell:  206-890-4188

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