This is to receive WX APT signal on 137 Mhz and sometimes to work on VHF or
listen to avi band.
According you 'd it be interested or not at all to select a discone instead
of the helix ?
There is no advantage of using a discone, or even drawbacks vs. the helix,
excepted the price ?

Thierry


"Roy Lewallen" wrote in message
...
A discone antenna is a vertically polarized, broad bandwidth antenna. A
quadrifilar helix is a circularly polarized, relatively narrow bandwidth
antenna. About the only thing they have in common is that both are
omnidirectional in azimuth. A quadrifilar helix is a more suitable
antenna for receiving the circularly polarized, relatively narrow
bandwidth signals from a weather satellite.

Roy Lewallen, W7EL

Thierry wrote:
Hi,

To pick up a 137 MHz signal from wx satellite (POES), are the discone
and
quadrifilar helix antennas similar, I mean, they are different in design
but
for the rest ?
Are they both omnidirectional and are they both able to change
automatically
the elevation and azimuth to the satellite direction without
interruption
and without requiring a rotator ? or only the helix provides this
capability
?

Thanks in advance

Thierry, ON4SKY
http://www.astrosurf.com/lombry