[TowerTalk] closeness to commercial building roof top

[n4kg@juno.com]

It it is placed at the edge of the roof, it should act like
a 70 ft high antenna when pointed away from the building.  

When aimed over the roof (assumed flat), if the 5-30 degree
reflections intersect the roof, it will probably act like a 10 ft high 
antenna.  Sorry.

I suspect some DXpeditions have fallen victim to this scenario.

(This assumes the roof contains continuous metallic structual
members.)

de  Tom  N4KG

#  #  #  #  #  #  #

On Tue, 2 May 2000 10:04:51 -0500 brunet@us.ibm.com writes:
> 
> 
> We are considering mounting a 10m-40m yagi on the top of a 
> commercial
> building.  The roof is about 60' above the ground level.  We want 
> our
> antenna at 70', so a single 10' tower section is all that is needed 
> above
> the roof, but I am a little concerned about that being too close to 
> the
> roof and getting some interaction.  Any thoughts on that?  Thanks, 
> Pete
> ws4g
> 
> 
> 
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