Posted: 9/17/2013 6:09:16 PM EDT
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Using trees for antennas.. Just thought I'd leave this here
http://www.dtic.mil/dtic/tr/fulltext/u2/742230.pdf |
See the actual pictures at the KF4BWG website and scroll down to the bottom of the page  
His HORSEFENCE ANTENNAS have a great reputation as well! I didn't want to copy his pictures since they are copy protected. Now for a little Tree Humor..... Check this out,KF4BWG Using a Walnut tree as his 2 Meter antenna. (Note Tree not for sale) BWG Antennas Loaded up and using a Walnut Tree as a 2 Meter Antenna. BWG Antennas Here's the proof in the pudding, Freq 146.44 Mhz, SWR 1.0 Talking on the Tree at the Shelby Ham Fest North Carolina. I brought this Beech, tree to the hamfest from home. The process works because of the sap in the tree. Using an antenna analyzer and about 9 feet of coax I drive the nail into the tree until I get a 1.0 s.w.r. The depth of the nail is very important. I kept the tree in a bucket of water to keep the tree moist. It drank about 3 gallons of water over a 5 day period at the ham fest. Some folks wondered what I had in that bucket. Using a field strength meter (sitting on top of tree) I demonstrated that the signal radiates from the entire tree including the branches and leaves when transmitting. The S.E.R.A. repeater journal ran a second story about me at Shelby Hamfest in the January 2002 issue. BWG Antennas Measuring the RF Radiation from the tree and it's leafs. |
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http://www.youtube.com/watch?v=9tIZUhu21sQ
Same principle at work, using a magnetic coil to couple to and energize a conductive item. 
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