jimlux wrote:
> 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
Correction... the FCC specifically rejected a particular limit.. They
had received comments prior to the rulemaking recommending the BOCA
building code which says that permits are not required for structures
less than 12ft above highest point.
>
> 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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