[Lowfer] Black Hole Antenna

[Zack Widup]

Hi All,

I was wondering if any of you have built the so-called "Black Hole 
antenna" for lowfer work.  I know quite a few of the people at the ULF-ELF 
group I'm on are using them.

The antenna is based mainly on the works of John F. Sutton of NASA and a 
paper he wrote.  It is also described in US patent 5,296,866.

I'm interested in using this antenna for an application in the 100 kHz to 
1 MHz range with ferrite bar antennas. I have a couple questions about it. 
For one, does the feedback loop use the same number of turns as the search 
coil?  And what is the best way to electrostatically shield the two 
windings?

73, Zack W9SZ