The first I did like always was to consult my good friend Mr google.

The design could not be very big because the possibilities and available space where limited. 

At some point I found the schematic of the receiving loop with simple parts and most of them I had in my junkbox.

More information you can find at

http://www.hard-core-dx.com/nordicdx/antenna/loop/coaxloop.html

It’s a simple design and its limited in bandwidth but its working.

With the RX loop my possibilities were growing again the noise level was dropped.

After some time I built the same but 2 of them opposite of each other.