Here is a coax balun made by coiling 28.5 inches of RG-6 into 3 loops. The idea was found on Brian Beezley's web site:
http://ham-radio.com/k6sti/balun.htm
A full description of its usefulness can be found there.

RG-6 coax was Belden 1694A purchased from Blue Jeans Cable:
http://www.bluejeanscable.com/