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I had great success building my first antenna: a Windom. I'd next like to build a 9:1 balun for a long wire for portable receiving in the back yard away from the house (it would connect to a Lowe HF 150 - not a portable in the traditional sense).

All references I read report that one should use 18 AWG enameled copper wire. Is there some special property to enameled that requires it to be used? Should there be some type of medium between the wire wound around the toroid? Just not sure I get the enameled part.

Suggestions are appreciated.