Editing Yagi Antenna

The '''Yagi''' (Yagi-Uda) is a directional beam antenna: a driven element plus a reflector behind it and one or more directors in front. SimTX provides a '''3-element''' and a '''5-element''' version.

== Configuration ==
The boom points along the configured azimuth; elements are horizontal. The driven element length defaults to 10.1 m; a value of 0 sizes the antenna for the operating frequency.

== Characteristics ==
{| class="wikitable"
! Version !! Typical gain !! Typical takeoff angle
|-
| 3 elements || 7.5 dBi || 14°
|-
| 5 elements || 10.2 dBi || 10°
|}
* Strongly directional: most of the power goes toward the azimuth heading, with a large front-to-back advantage. Aim it at the target region; a misaimed Yagi is worse than a dipole.
* Low takeoff angles at reasonable heights make Yagis the tool of choice for long-distance work on the higher HF bands.
* Wider SWR bandwidth than simple wire antennas, the 5-element version widest.

== Practical notes ==
* Set '''Azimuth''' to the great-circle bearing toward the target area (0 is north, 90 is east).
* A full-size Yagi for the low bands is enormous (a 3.6 MHz driven element is about 40 m); realistically they are used from roughly 14 MHz upward.
* Height still matters: mount at least half a wavelength up for the advertised low-angle performance.

== When to use ==
For point-to-point and long-distance coverage toward a known direction on the higher bands. For all-around coverage use a [[Dipole Antenna]], [[Vertical Antenna]] or [[Full-Wave Loop Antenna]] instead.

[[Category:Antennas]]