Yagi Antennas from RF Code

A Yagi antenna, is a directional antenna consisting of a driven element (typically a dipole or folded dipole) and additional parasitic elements (usually a so-called reflector and one or more directors). The reflector element is slightly longer (typically 5% longer) than the driven dipole, whereas the so-called directors are a little bit shorter. This design achieves a very substantial increase in the antenna's directionality and gain.

Specifications:

Three-Element 433 MHz Yagi Antenna Specifications (typical)

Frequency	433.92 MHz
Gain	6 dB
Front-to-Back Ratio	20 dB
Pickup Angle	+/- 45 degrees
Polarization	Vertical or horizontal
Impedance	50 Ohms
Connector	Type N female
Material	Aluminum
Overall Length	14 in
Maximum Width	16 in
Maximum Thickness	1.25 in
Mounting	V bolts, 1 to 2 inch pipe

Seven-Element 433 MHz Yagi Antenna Specifications (typical)

Frequency	433.92 MHz
Gain	10 dB
Front-to-Back Ratio	20 dB
Pickup Angle	+/- 30 degrees
Polarization	Vertical or horizontal
Impedance	50 Ohms
Connector	Type N female
Material	Aluminum
Overall Length	25 in
Maximum Width	14.5 in
Maximum Thickness	1.25 in
Mounting	V bolts, 1 to 2 inch pipe