scotts electronic Parts It was not cheap but it would do the job. The wire was mounted on the frame easily and terminated with two brass nails. I measured the inducance and found it was 65uH, meaning around 1700pF would be needed to resonate the loop at around 475kHz. This value was soldered across the brass pins.
A visit to the local emporium produced all the components for the preamp including a box and stripboard. This was assembled and attached to the mast with adhesive backed velcro and a 9V battery attached. . I hooked it up to the ANAN-10 and took a listen around 475kHz. but I noticed that the PowerSDR software was indicating an A/D overload. The preamp was acting as a wideband power oscillator! I re-examined the wiring finding a couple of extra short circuits which were fixed. Reconnecting it to the receiver I could hear the WG2XIQ on 475.7kHz and the antenna showed the expected very sharp nulls
131028 0152 25 -7 0.3 0.475663 WG2XIQ EM12 30
131028 0156 24 -8 0.5 0.475663 WG2XIQ EM12 30
131028 0200 23 -9 -2.0 0.475663 WG2XIQ EM12 30
131028 0208 10 -21 -1.4 0.475663 WG2XIQ EM12 30
131028 0212 10 -21 -0.3 0.475663 WG2XIQ EM12 30
131028 0216 11 -20 -0.2 0.475664 WG2XIQ EM12 30