I have build a very easy active antenna designed by PA0RDT.
I placed it into a little milk bottle on the top of a fiberglass mast about 8m above the ground.
Results are very surprising. The antenna gives excellent results between 9Kz and 3600Khz. (picture from internet)
![pa0rdt Mini Whip 5](/images/VLF/pa0rdt-Mini-Whip-5.jpg)
Electronic schema here
![pa0rdt antenna](/images/VLF/pa0rdt_antenna.gif)
Supply
![pa0rdt Mini Whip 4](/images/VLF/pa0rdt-Mini-Whip-4.jpg)
PCB layout
![pa0rdt Mini Whip 2](/images/VLF/pa0rdt-Mini-Whip-2.jpg)
Installation schema
![pa0rdt Mini Whip 3](/images/VLF/pa0rdt-Mini-Whip-3.jpg)
DON'T FORGET :
1) This antenna MUST be installed on a non-metallic pole.
2) To be efficient the antenna must be installed at least 35-45 foot high (12m -15m)
3) The antenna must be kept away around 70 feet (20-25m) of surrounding buildings, it doesn't works inside buildings.
4) The shield of the coaxial cable will be grounded with a earth stack at the bottom of the pole.
Pictures.
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