In electronics, Y is the abbreviation for Admittance, the reciprocal of Impedance (measured in Ohms, W). For DC current, Resistance and Impedance take the same value. For alternating current the inductance or capacitance of a conductor cause the effective resistance to be greater than it would be for DC current. Impedance is the measurement of effective resistance at frequency. Admittance is the ease of current flow at frequency.

When referring to the orientation of an antenna the Y-Axis takes on the same meaning that it does in Cartesian mathematics. Aligning an antenna involves rotating the antenna around the X- Y- and Z-axis. Rotation around the X-Axis implies that the antenna is being aimed up or down. Rotation around the Y-Axis implies that the antenna is being turned left or right. Rotation around the Z-Axis implies that the antenna is being rotated clockwise or counter-clockwise.

A directional antenna with parasitic directors in front of a dipole element, and reflecting elements behind the active element. The term "Yagi-Uda" is also used for this type of antenna after the inventor, Mr. M. Uda. The Yagi antenna creates a beam pattern with a very narrow vertical beamwidth relative to vertically-oriented dipole, reflector, and director elements. The antenna elements can be exposed or the director/dipole/reflector construction can be built as a cylindrical antenna component. Yagi antennas are typically used only for point-to-point links.