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[TowerTalk] How to get another 10' in height? Add a mast or add another

To: TowerTalk <>
Subject: [TowerTalk] How to get another 10' in height? Add a mast or add another section?
From: John W <>
Date: Mon, 9 Jan 2012 20:23:17 -0800
List-post: <">>
If I have a Rohn 45G tower of a given height, let's say 90', guyed per the Rohn 
book, and rotating from the base, hosting several side-mounted yagis for 10m 
(3), 15m (2), and 20m (1), and I want to add another antenna up at 100' (a 
small 40m 2L) that also rotates with the tower, which one is the safer/better 
installation:  adding a mast that protrudes 10' above the top of the tower (and 
for some distance down into the tower), or adding another 10' section and 
sidemounting the new antenna at the top of it?

This is a theoretical question, because I haven't built the tower yet, but I 
plan to.  

The first reply many might have is probably: Why don't you just build it to 
100' per the book, instead of 90'?
The answer to that is that I don't have enough real estate to put guy anchors 
80' from the base, I only have 72' available.

Also, I have not even seen hardware that allows adding a FIXED mast at the top 
of a Rohn tower - sort of like a thrust bearing that can't turn. How is this 
typically done?

Thanks & 73,


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