Antenna Plans

Build a 4 Elements Yagi

Material list for building a 4 Elements Yagi

  1. 1″ X 0.5″ Rectangular Aluminum tubing for the boom
  2. 3/8″ Aluminum tubing for antenna elements
  3. 1cm Outside diameter antenna tubing for elements holder
  4. 1pc SO239 connector
  5. Pop rivets / Rivet tool
  6. #12 AWG Copper wire with insulation (12″for Gamma match)
  7. Soldering iron
  8. 8pcs Stainless steel nuts and bolts 20mm length 3mm diameter
  9. 1, Butterfly nut and 1 bolt 18mm length 3mm diameter
  10. Aluminum plate 0.5mm thickness
  11. Collapsible tube (shrinkable tubes)

Download Yagi Dimensions Here

To build the 4 Elements Yagi you may follow the direction for building the 3 Elements Yagi except that you will add an additional parasitic element (director) which is about 5% shorter than the last element of the 3 elements yagi. The spacing are the same between the elements and when built successfully it will give you a very desirable 9.39dBi gain or about or about 7.24dBd.

To increase the performance you may also configure the antenna in stack configuration by making two antenna’s and connect it with a phasing harness for increased performance.

Antenna Gain Simulation and Signal Pattern Using 4Nec2 antenna modeling.

Front to Back Ratio: 9.92dB
Antenna Gain: 9.39dBi
Beamwitdh: 70° Vertical 54° Horizontal

Vertical Pattern 4 Elements Yagi
Horizontal Pattern 4 Elements Yagi
Combined pattern 4 Elements Yagi