Hi Colin, I have a friend who used a copper loop antenna 
approximately 36 inches in diameter to conduct DX with European 
stations using I think 10 watts.  He lived in an apartment and 
was using a digital protocol but I can't remember which one it 
was other than it wasn't PSK 31.  Pretty amazing stuff, but each 
contact takes a while, kind of like it will be when we have folks 
living on Mars! 73, Jim WA6EKS

 ----- Original Message -----
From: Colin McDonald <[log in to unmask]
To: [log in to unmask]
Date sent: Sun, 20 Oct 2013 22:42:00 -0600
Subject: Re: interesting article

I have yet to hear one of these actually on the air.
The theory is logical, and the science supports it, but in real 
world
performance I'm not sure how successful they've actually been so 
far.
The key to using a tiny HF antenna is to communicate with people 
who have
big high gain antennas hi hi.

73
Colin, V A6BKX
--------------------------------------------------
From: "Howard Kaufman" <[log in to unmask]
Sent: Sunday, October 20, 2013 1:59 PM
To: <[log in to unmask]
Subject: interesting article

 Here is a very interesting article on small HF antennas and the 
theory
 behind them.
 PVC pipe and fruit cans, both readily available.

 http://www.rexresearch.com/harteh/harteh.htm


 H T Kaufman MSW LCSW
 Adaptive Technology Instructor