Yes, there was an antenna with the "sting" months ago, now that I see your
PDF I remember but can't remember the price and the brand.

On Tue, Apr 3, 2012 at 10:05 PM, <b...@lysator.liu.se> wrote:

> Typical chokerings are L1/L2 geodetic antennas. There is however "simple"
> L1-only chokerings available from time to time on *bay. I have often seen
> them as low as in the $50 range. Orginal use I think was for DGPS
> reference stations. Most seem to be the Aeroantenna model in the url
> below.
>
>    http://www.aeroantenna.com/PDF/AT575-90_G.pdf
>
> However they have usually been rebadged by Novatel, CMC or Leica.
>
> --
>
>   Björn
>
> > If the satellite is above the mask, the signal will be used in computing
> a
> > solution even if it got in through reflexions and multipath. That's why a
> > good antenna with choke rings is desirable.
> >
> > Didier KO4BB
>
>
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