"Volker Tonn" wrote:

On technical reason a ground plane
antenna can NEVER work as a broadband
antenna. It is limited to some frequencies
or relatively small frequency ranges with
acceptable gain.

A discone has some gain above 0dBi on
the wohle specified range up to 2 dBi. A
groundplane has some gain up to 3 or 4
dBi on resonant frequencies and dramatic
loss down to -(!)15dBi on nonresonant
ranges.


You set an unreachable standard, Volker. There is no antenna made that is
not more resonant on some frequencies and less resonant on others. Certainly
some do perform better than either the ground plane or discone, but these
antennas have their place also. Few antennas can beat the utter bandwidth of
a discone and the ground plane is ideal where an even less intrusive antenna
is desired. Indeed, I've had success with a simple wire that is probably not
directly resonant on any desired frequency. In other words, any antenna is
clearly better than nothing.


Dwight Stewart (W5NET)

http://www.qsl.net/w5net/