Gamma match

[kq6qv]

This is a geometry that allows the driven element to be connected directly to a 75-ohm coaxial cable, no balun needed. Its problem is that it works well for only one channel. Even makers of single channel Yagis tend to avoid this solution since single channel Yagis are often used for viewing other channels that are strong.
[img]http://www.hdtvprimer.com/ANTENNAS/gamma.gif[/img]