Al Klein schrieb:

On Tue, 30 Nov 2004 23:32:18 +0100, Volker Tonn
said in alt.radio.scanner:


Sven schrieb:

So the range is identical to a discone? 50-1300 MHz ? I don't really
understand the band calculations.


The 1:3 SWR bandwidth of the X-5000 is app. 80 to 1300Mhz.


The "bandwidth" is actually 3 band coverage - 144-148 MHz, 440-450 MHz
and 1.2 GHz. An antenna like that is pretty deaf at all other
frequencies - it's a very NARROW-band antenna.

I have a nearby guy using that antenna. It has(!) sgnificant gain all
over a high quality discone from 80 to 1300Mhz.
This antenna WORKS very well on receiving VERY BROAD. On TX for sure it
is narrow for SWR 1:2 or better.


BTW, a discone doesn't really have gain - it's just a very wide band
interface between the cable and space.

You may tell us what _your_ definition of 'gain' is.
Every(!) piece of junk metal has a little bit of gain over an 'isotropic
radiator'.
A discone has about 1-2dBi and a 'narrowband' 1/2 wave dipole has
2,15dBi. Also gain allways increases when a antenna is mounted in the
right distance over real electrical ground.