[time-nuts] Antennas, roofs

d.seiter at comcast.net d.seiter at comcast.net
Wed Feb 18 08:45:39 UTC 2009

In my case, I have a large number of low angle peaks and valleys (hence the leakage issue); my sky view is really good, and I'm planning on putting a set of parallel horizontal bars about 18" apart between my 4" sewer riser and another point about 15' away. All cables will be going through a 5" roof T vent which happens to be attached to nothing in particular (I had to insert a screen to keep the roof rats out- they were not happy!). The big issue is that I can't get inside the crawl space of the area in question, so I need to wait for drier weather to rip up the existing roof and put everything in place. 


----- Original Message ----- 
From: "Ken Winterling" <wa2lbi at frontiernet.net> 
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com> 
Sent: Tuesday, February 17, 2009 6:33:40 PM GMT -07:00 US/Canada Mountain 
Subject: Re: [time-nuts] Antennas, roofs 


If your new roof will have a ridge vent you can poke the antenna cables 
through it to the outside leaving enough slack to create a drip loop before 
continuing to the antenna(s). Since the ridge vent follows the slope of the 
roof the cable will exit on the down side so water will run off. 

Ken, WA2LBI 

On Tue, Feb 17, 2009 at 19:18, Hal Murray <hmurray at megapathdsl.net> 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. 
> -- 
> These are my opinions, not necessarily my employer's. I hate spam. 
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