Michael Ryan wrote:
> Where did that 12 - 15 ft above a structure come from? - m
I'm not sure, but you see restrictions of "12 feet above the highest
point of the structure" for all sorts of things, so I suspect the FCC
just adopted it for the old CB antenna rules. I just looked up the newer
rules and it's 20 ft.
The OTARD rules also have the 12 foot limit
Probably comes from some standard structural size for pipe or something.
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of jimlux
> Sent: Tuesday, June 02, 2009 9:44 AM
> To: Dan Zimmerman N3OX
> Cc: towertalk@contesting.com
> Subject: Re: [TowerTalk] optimum vertical length
>
> Dan Zimmerman N3OX wrote:
>>> If one uses the old CB antenna rules of 12-15 ft max height above
>>> structure as a constraint, are you better off with some sort of short
>>> vertical dipole, up 30 ft on the roof, or with a 45 ft vertical, on the
>>> ground?
>
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