I've just built the one in ON4UN's book and it is superb. Mine is 1dB down at 1770KHz and when properly terminated exceeds -40 after that..... When I wound the inductors to the figs stated it was 'off' but did it by number of turns and great. Built 'ungly style' on a bit of PCB and now covered in contact adheasive to hold it tight while outside... Ian