Figure 29 Vertical Installation of the Helical Antenna

Form for Shortened Helical Antenna Made of Plastic Bottles

Plastic PET bottles are widely used in the food industry. Empty plastic bottles could be successfully used to make form for a helical antenna. The form made from plastic bottles is very light, cheap, has larger diameter that gives benefit for the efficiency of the helical antenna.

Figure 30 shows how to make form from empty bottles. Picture 13 shows preparation of the bottles for making form for helical antenna for the 40- meter band. Picture 14 shows experimental helical antenna for the 40- meter band made on the form from empty bottles. Length is 2 meter, shortened factor is five.

Picture 13 Bottles for Making Form for Helical Antenna for the 40- meter Band

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