There is something odd about Copper clad steel wire.
I used some 24 Gauge to construct a 70m diameter horizontal loop.
I'd chosen to use this type of wire in order to minimise the weight of wire and the wind loading. However the performance was so poor that I quickly abandoned it.
I could not figure out what the problem was, as my first attempt at the loop used 0.7mm tinned copper wire which seemed to work much better (however this was before I was able to make quantitive A/B field strength measurements).
The only significant factor I could identify was the rather high DC resistance of the Copper clad steel wire, which measured 17 ohms for the 70m length of wire I used. I guess 26 Gauge would be worse. I don't think it was specifically the DC resistance that was the problem (but I guess it didn't help) but it may have been an indicator of the limited depth of copper plating on the wire.