Hi Graham I believe this is known as "drop-wire" ( I was not actually in the 
Telphones area) If so it is a mixture of steel and copper strands, and will 
stand a far longer span that pure copper or even the special alloys used for 
rigging professionally. I would say as a top wire it would be fine but use some 
copper for the vertical section of an L or T where there is significantly more 
current flowing than in the top-load. Loss in the top load doesnt matter too 
much as this is not really radiating anything usefully on LF, but is a vital 
capacitance to ground. Another way of thinking of it is that by the time the 
current reaches the top it has already traversed the Radiation-resistance. 
(only true for very short aerials!)

Alan G3NYK

--- On Sun, 10/1/10, Graham <[email protected]> wrote:

> From: Graham <[email protected]>
> Subject: LF: GPO/BT Wire  No '10' any use for  long wire Ae ?
> To: [email protected]
> Date: Sunday, 10 January, 2010, 22:47
> 
> 
>  
>  
> 
> 
>  
> GPO/BT Wire  No
> '10' any use for  long 
> wire Ae ?
>  
> Looks like the  wire
> is used from pole 
> to  house , has supporting wire and thinner conductors
> in a pvc sheath 
> 
>  
> anyone any idea
> about  its suitability for 
> a  long  wire  Ae ?
>  
> tnx - G ..
> 
> 
>  
>