Baluns
Links
Much on Balun Design and Use
4:1 balun design and operation
LC Balun Designer and other calculators
Creating a balun
Power Point Presentation on Baluns
4:1 Baluns
Another 4:1 Balun Using PVC
How To Build a 4:1 Current Balun
Choosing the Correct Balun by W8JI - G4NVH
Baluns - What They Do and How They Do It