Topband: WD-1-A Field telephone wire.

[K1FZ-Bruce]

Bottom line -This wire works well in two wire BOG antenna applications. 
 
Something to think about.  Steel strands are off set by four copper strands. 
 
If we so afraid of steel magnetically interfering with the signal why are we using steel towers for transmit.?
Yes they are galvanized, but zinc is a rather poor conductor, but better than steel. 
 
One needs to take into consideration that the tower is a fat conductor. each leg is in parallel with the others. 

Like resistors in parallel resistance is lowered, so losses are OK as is. 
 
Some how we took something that is working well and are trying to say it is not. 
Typically we develop products the opposite way around. 
 
 Please don't loose any sleep over it, but if you do, could go work some DX. 
 
73
 
Bruce-k1fz
http://www.qsl.net/k1fz/flag_antennas.html