A Portable 8-Element Wideband Yagi for 70-cm ATV

Here's a simple broadband yagi antenna that can be built on a 4 foot boom and used for portable ATV, SSB, or satellite work on the 70-cm band. It's a scaled down version of the 144 MHz ultra wideband yagi produced by Rutland Arrays. The antenna design was optimized for broadband performance using YAGIMAX software.


The antenna should be built on a non-conducting boom, such as a wooden ferring strip or dowel. The elements are #10 solid copper wire (with insulation removed). The driven element is matched to a 50 ohm unbalanced feed using a `T' match and a half wavelength coaxial balun.

delta matching section

Approximate dimensions of the driven element and delta match that provide a low SWR across the lower portion of the 70-cm band. Multiply dimensions by 2.54 to obtain lengths in centimeters. Balanced feed is obtained across the 0.5 inch gap in the lower portion of the delta match.

radiation pattern

Actual antenna performance closely matches the computer simulation shown here.


John Magliacane
Electronics Engineer
FCC General Radio Operator Licensee
Open Source Linux Software Developer
Advanced Class FCC Amateur Radio Operator (KD2BD)