[time-nuts] Antennas, roofs

[Bruce Griffiths]

Hal Murray wrote:
>> I really need to put in a feed through to the roof because my Z3801A
>> is struggling with an indoor antenna too; but the roof needs to get
>> replaced first... 
>>     
>
> Speaking of antennas and roofs....
>
> Currently, my antennas are inside.  That's good enough most of the time.  
> It's also good for providing nasty test cases to software.
>
> I also need a new roof.
>
>
> I'm scheming to poke a hole in the roof so I can get some antennas in a 
> better position.
>
> If I have more than one antenna, does it matter how near eachother they are 
> located?
>
>
> I'm picturing a plastic pipe that sticks up a few feet and a bracket at the 
> base that has the right magic angle to match the pitch of my roof.  The pipe 
> would screw or glue into the bracket.  The bracket would get screwed to the 
> roof over a hole.   The cables would go through the hole and up inside the 
> pipe.
>
> I haven't worked out the details for the top of the pipe yet.  My (handwave) 
> straw man is a U turn to keep the rain out, and mount the antennas on the 
> main pipe.  Maybe a T to get them out to the side.
>
>
> Do brackets like that exist?  If so, what term or brand do I google for?  I 
> have a typical not-very-steep sloped roof.  Is there a standard angle?  ...
>
> Plan B would be to stick the pipe through the roof and attach it inside to 
> the side of a rafter.  I assume the roofers can treat it like a plumbing vent 
> pipe.
>
>
> A slightly crazy idea...  Has anybody poked antennas up inside a skylight?  
> I'm thinking of the setup which has a hole in the ceiling of a room, a box 
> from that hole through the attic space up to and through the roof, and a 
> plastic dome on top.  A shelf or bracket on the inside of the box would get 
> the antennas almost on the outside.
>
>
> I've seen ads for metal roofs/shingles, the claimed advantage being long life 
> which is attractive to me.  I assume they would be a disaster for antennas 
> inside.  What about outside, slightly above the roof?  I'd expect bad things, 
> but maybe there is some way to turn it into an advantage.
>
>
>
>   
Instead of making a custom mating flange for the particular roof angle,
you could mount the pipe perpendicular to the roof and mount the antenna
on a bracket on a bracket attached to the pipe.
Just drill the bracket so that the antenna is vertical.
See attached images for possible details.

Bruce
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