I noticed this message as well, and they were talking
about patch antennas on the PC board.  While someone did use
the word 'radar' my impression was it was a small
transmitter for a fox hunt kind of system.
http://darts.c2-tech.com./index.html
http://darts.c2-tech.com/rdr_comp.htm#horns_and_patches



Peter L. Peres wrote:
>
> Hello,
>
>   I have run into a message that stated that someone has built some sort
> of radar / interrogartor based on a PIC (two PICs if I remember well). The
> message has disappeared meanwhile and I did not get a good look at the URL
> it gave. Searches gave nothing at all (dejanews and web).
>
>   If anyone knows something and is willing to part with the information,
> then please do.
>
> thanks you,
>
> Peter