Ken WB4ENE -
This is a revolutionary new antenna. I call it the MRA (Minimal Reactance Antenna). It gets its name from the network analyzer plot from 1.6 - 30 Mhz. The reactance curve crosses the real line only once, at 6.89 MHz, where this 8ft tall antenna is resonant. The antenna works on 160m through 10m. It is a top-loaded monopole. I don't think there has EVER been a top-loaded monopole with as much top-loaded capacitance as this MRA. Its mast is a 6 inch cylinder pipe, 6 feet long, that is surrounded by the 6 foot diameter octagonal group of panels of aluminum sheet. The metal conductivity is optimum and every scrap of efficiency is gotten from how it is put together.
I match the antenna with a remote LC network made by John Bliss. The "trampoline" base is 18 feet in diameter and is connected to the shield side of the feed-line through the tuner. Only 15 uH of inductance is needed to make a 50 ohm match.
The design is scalable, from 250 feet (for 40kHz submarine broadcast) to nanometer arrays etched on silicon wafers. A beer-can + pie-pan can be used for a 2 meter version.
Long radials are not required. I have NO radials.
On the recent 160 meter contest I worked 265 contacts; 40 US states and 14 countries in 12 hours. If you would like a schedule to hear the antenna, contact me at wb4ene @ bellsouth net (delete spaces, add .)http://ken.crawley.org