Topband: Aluminium roof vs antenna performance

[Riccardo Negro]

Grant, tnx also to you.
I think you highlight the very critical point; electrical connectivity
along panels is likely to change along time and could randomly impact the
pattern/SWR of nearby antennas.
I think I will opt for a neutral (no aluminium) roof: I'll miss a good
ground for a roof mounted vertical but I will avoid headaches because of
panels bonding.

Rik, IK2CAW


2013/10/18 Grant Saviers <grants2 at pacbell.net>

> I had a 40m and 80m top loaded vertical on galvanized steel roofs. The 80m
> was outstanding for DX and the 40m so-so since the roof was not well bonded
> electrically.  IMO, unless you can insure electrical connectivity along the
> panel seams there will be no advantage to the foil.  You would probably be
> better off with a good radial field under the poly foam, a small gauge wire
> will work if you put up 50 or so radials and you could staple those to the
> roof sheathing. Then you could extend that radial field with some elevated
> radials if space permits.
>
> Grant KZ1W
>
>
>
> On 10/18/2013 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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