[TowerTalk] Need help with tower info

[Chris Hoelzle]

Hello - I am intending on putting up a tower at my new home in Bandon, Or. I
have 40 acres and it is surrounded with 70 foot high timber. When I saw the
layout and I thought I would put up a 150ft tower. I will not be doing this
often, so I want to put it up once and have it stand. General TIA wind
ratings for the county are 80mph, with "special areas" - and of course I am
in one of those special areas which has ratings of 110mph.

 

Right off the bat I excluded putting up a Rohn 25G, opting instead for a 45G
- but then a buddy of mine said that he would go for a 55g.

 

I intend on putting up a big M2 or Mosley multi-bander (15sqft) and a 40
meter three element (20 sqft).

 

I know of folks that have these sorts of setups, but when I take a look at
the Rohn wind load I was really surprised.

 

A Rohn 45 150 foot 130mph rev G / 110 mph Rev F shows it will only allow
10.4 sqft of load.

 

So, I thought a Rohn 55 would do the trick but it shows:

 

Rohn 55 150 foot  130mph rev G / 110 mph Rev F shows it will only allow 16.6
sqft of load.

 

Are the specs WAY too conservative or should I put up a really HUGE tower to
accommodate what I want to do?

 

Any thoughts on my conundrum would be greatly appreciated.

 

 

NN6CH

Chris Hoelzle 
choelzle at cox.net 
Laguna Niguel, CA