Topband: Aluminium roof vs antenna performance

[Riccardo Negro]

Jim, tnx for sharing your direct experience.
Best 73 de Rik, IK2CAW



2013/10/18 Jim Bennett <w6jhb at mac.com>

> Rik -
>
> Last year we replaced the 20+ year old roof on our house. It was made of
> treated cedar "shake boards", with simple tar paper and plywood underneath.
> My antennas consist of (1) 26.8 meter long doublet fed with 450 ohm ladder
> line, (2) 80 meter Inverted L, (3) 160 meter Inverted L, (4) 5/4 wave 2
> meter vertical.
>
> The choice we had was to go with either concrete tiles or powder coated
> steel from Gerard . At first I was hesitant to do this, but the dollar
> difference made the decision for us - we had the powder coated steel
> installed. From what I can tell, it made almost zero difference in the
> performance of my antennas. Perhaps if I were to take the time (and a long
> time it would be) to model it in EZNEC, I might see a change in radiation
> pattern. However, I am still able to work the same amount of DX and
> stateside station as before. In addition, my antenna tuner apparently did
> not have to "re-learn" settings for that doublet. My suggestion is to go
> with whatever is best for you, either in cost or insulating efficiency.
>
> Jim / W6JHB
>
> p.s. - the roof we had installed looks exactly like the one here:
> http://www.gerardusa.com/steel-metal-roofing/products/barrel-vault
>
>
> On   Friday, Oct 18, 2013, at  Friday, 9:26 AM, Riccardo Negro wrote:
>
> > Hi all,
> > tomorrow I must decide which type of insulating system to be used under
> the
> > tiles of my new roof. Roof's structure is classic wooden and total
> surface
> > is 220 square meters.
> > Since there will be several antennas for 80 / 160 sorrounding the house I
> > am wondering if using insulating panels (polystyrene) covered with a foil
> > of ALUMINIUM (to reflect heath) could become a nightmare for antenna
> > resonance, pattern, etc.
> > The point is: better to have or not to have a roof with aluminium under
> the
> > tiles ?
> > Many thanks for your kind advice !
> > 73 de Rik, IK2CAW
> > _________________
> > Topband Reflector
>
>


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