diff --git a/README b/README
index a5909b5..e2a47b4 100644
--- a/README
+++ b/README
@@ -154,6 +154,13 @@ You can easily build a very cheap antenna following the istructions at:
 With this trivial antenna I was able to pick up signals of aircrafts 200+ Km
 away from me.
 
+If you are interested in a more serious antenna check the following
+resources:
+
+* http://gnuradio.org/redmine/attachments/download/246/06-foster-adsb.pdf
+* http://www.lll.lu/~edward/edward/adsb/antenna/ADSBantenna.html
+* http://modesbeast.com/pix/adsb-ant-drawing.gif
+
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