In a message dated 98-07-05 21:22:03 EDT, rthorne@arn.net writes:
> According to the rohn catalog a 120' 55g tower in 90mph winds can handle
> 23.1 square feet of antenna (15.1 + 8 for side mounts that won't be on
> the tower). This 23.1 is on top of the tower.
Actually the 23.1 sq.feet is TOTAL tower capacity. Doesn't really matter
how it is distributed.
>
> Now if one starts stacking yagis at various heights, does the 23.1
> square feet still hold or does it change? Does that number go up or
> down since the square footage is spread all over the tower. For example
> if the tower was only 100' the square footage increases to 24 square
> feet. Not a big jump but I have to assume the tower can handle more
> antenna at the 40' level than at the 120' level.
>
See above comments. The tower capacity remains the same.
> So how does one safely determine how many antenna's (square footage
> wise) can be stacked on the tower?
>
You already got your answer. 23.1 sq.ft. is the number.
Cheers, Steve K7LXC
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