The PA8W RDF41 kit and the RDF42 kit: pre-assembled and tested kits:

These very economic, almost ready to use kits will give you semi professional performance.
You just have to build a housing around it plus the antenna array of your choice.

This is not the toy quality you find in hard switching, 16-LED  amateur designs!

And when you’re really lucky I may have a ready to use prototype for sale for a very modest price.

Just contact me:

Radio direction finder RDF41 light PD0G