By G8MNY (Updated Dec 04)
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This type of balun is to be found in most textbooks & many aerial designs. It is a 1:1 balun & does not alter the impedance.
Balun is made from ¼ wave lengths of scrap coax (longer needed to cover the fatter outer) braid or pipe over the top of the feeder. It is electrically connected to the coax braid 1/4 wave from the balanced feeder connections.