Hello

I wand to build a short range direction finding equipment (say 200m), and I
wonder what kind of antenna would be the simplest and best for that.
the frequency will probably be around 868MHz.
the precision needs not to be very high (30°).
the antenna will be mounted on a car, and should be as small as possible.
The equipment will be mainly used in an urban environment.

Thanks for any help, tip or link

Denis