One also makes a fine portable antenna for AO-27, easily bringing in that bird full-quieting at the horizon. That is a lot of performance in an antenna you can hold in one hand!Ī pair of these will provide circular polarization (see the picture above) and up to 3 dB more gain, depending on orientation. The free-space gain is calculated at an impressive 13.15 dBi with a 10.2 dB F/B ratio. Waterproof the connection with plenty of electrical tape or Coax-Seal and paint all the PVC parts to prevent UV deteriation.Ī single one of these quagi’s will give excelent service for all the LEO’s. I use crimp-on ring lugs to make a neat connection. Using stainless steel bolts, nuts, and washers, directly connect the 50 Ohm coax feed to the driven element. If 3/16″ aluminum rod is used for the directors, another 1/2 dB of gain is predicted–but hardly worth the effort. The following table is used for cutting the wire: while the driven element can be trimmed to tune the antenna, the directors should be cut accurately within 1/16″ or performance will suffer. The driven element and the reflector are formed out of 12 gauge wire (striped from house wiring, but insulation left on) and the directors are made from 10 gauge wire.

The antenna is built using 1/2″ PVC pipe (or 3/4″ if prefered) and several fittings.

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