Well, the answer is the same as before. Here are two references for you.
First, go to http://www.w8ji.com
and read about baluns in general. Tom designed the baluns which DX Engineering sells, and his expertise is unquestionable.
Secondly, log on to http://www.arrl.org
and look for the booklet "Building and Using Baluns and Ununs" by Dr. Jerry Sevick. It's $24 if my memory serves correctly. It is a wealth of information, and contains a lot of "how to" material.
There are somethings in life you just have to belly-up and pay for. This is one of them.