"Richard Clark" wrote in message
...
On Thu, 1 Apr 2004 20:21:39 -0500, "Jack Painter"
wrote:
Hi Richard,

Just wanted to mention, there are several discones on the market
assembled
with circular arrays of horizontal and 45-degree angle groundplanes plus
a
trimmable vertical element which is the only radiating element of those
discones. The vertical radiating element comes from the factory cut to 2m
but can be shortened to suit. I have owned a few and they are anything
but
deaf.

Best regards,

Jack Painter
Virginia Beach

Hi Jack,

It would be if it were designed to a lowest resonation (through
lengths involved) at 25MHz.

73's
Richard Clark, KB7QHC

Richard,

That makes sense...and the reason the ones designed as "scanner" antennas
are usually much shorter radials too, about 30" I think.. Though they
advertise 25-1300 mhz, I only used them for the 118-139 and 225-400 mhz
aircraft bands and 156 mhz marine band (where it was a poor performer in rx
and tx). The newer concept of discone called the "Scantenna" although for Rx
only, is a vastly superior performer than the standard discone design in the
bands I mentioned.

I currently use a J-Pole for marine band and have good 2-way between CG
Groups and aircraft over 100 miles distant. Accordingly, a J-pole woould
seem to be a natural for 2m work since mine is so close to that at 156.8
mhz, and it outperforms fishing-pole makers that advertise upwards of 6dbi.

73's

Jack Painter
Virginia Beach, VA