Has anyone taken a look at this antenna? I heard the designer on 75 last
night working a CT0, he says his is 18 foot in diameter. His buddy was
running a 6 foot version and 200 watts and worked the DX as well. He claims
that it is a "minium reactance antenna" thus the name.

http://www.smeter.net/wb4ene/mra-antenna.php