Alex Malyava wrote:
> Hi all,
>
> I am going to put a pair of 40m/20m inverted vee's on top of my two family
> house and I need an advice regarding support mast and mount.
>
> The house itself is big enough for 40m Inv V and the peak of the roof is
> about 30' above the ground.
> I think I can put 6..8' long plastic mast in center to get more or less
> acceptable diagram ( at least MMANA model says so :) )
> Since that is two family house I need to convince my neighbors (pretty good
> people) that i would not damage the roof...
> Well, how do I secure the bottom of the mast without any nails/screws? I
> think I've seen some roof mounts in HROs/QSTs, but I could not find any. The
> only one ad I found is for flat surface, not for vaulted roof.
> What do I use for a mast? Is it enough to use some random 3/4" extension
> from painter's department in home depot or I better use those 2" military 4'
> long masts?
We've been talking about this at work.. I have a concrete tile roof, so
have a similar problem. First: Silicone RTV is your friend. You can use
it to stick something to the roof and it's pretty durable.
Rummaging through the local hardware store, it looks getting some big
plastic funnels is the thing you want. You can carve them easily to fit
whatever shape you need (e.g. in my case, round cutouts to match the
roof tiles), then glue it down with silicone along the edges.
Then, you stick plastic pipe into the funnel and glue it too, both where
it touches the roof, and where it goes through the funnel (you have to
cut the funnel back so that the hole diameter matches.
For holding up a fairly inconspicuous wire, 3/4" plastic pipe works. (I
use the pink UV inhibited kind.. grey electrical conduit might work, but
I have some that's been outside for a few years, and it's turned almost
black, so I'm leery.. Maybe paint is the real answer)
If I have to remove it, it will be time for some razor blade work on the
silicone.
I fully expect the silicone to degrade, as well as the plastic funnel
and the pipe. It's not a 20 year solution.
Jim, W6RMK
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