On KW I only use a lazy loop for all the Bands from 160 to 10, the resonant frequency of

the loop is 3.650 Mhz. For matching the loop on the other bands I use a Toroid-Balun with

a transforming ratio of 1 : 2.5, if you are interested in building one, klick the icon to get a ZIPDOWNLOAD of the Information to homebrew one yourself or first have a look at it.