add reference to hamradioschool.com on Bob Witte's recommendation

diff --git a/Radio/index.mdwn b/Radio/index.mdwn
index e08f6337bd6aac84e0d75826fb9a58e07c3d07f5..8a22d08213b6a1a9beb24f440c7592e3ed3b3db8 100644 (file)
--- a/Radio/index.mdwn
+++ b/Radio/index.mdwn
@@ -45,7 +45,9 @@ choice with questions taken from a pool that is completely published ahead
 of time, and there are some great online resources for learning the material
 and taking practice exams until you're ready to take the real test.  This 
 [ARRL page](http://www.arrl.org/FandES/ead/classes.html) is a good place
-to start.  
+to start.  We also have it on good authority that the book and iOS app 
+available from [Ham Radio School.com](http://hamradioschool.com) are pretty
+good.
 
 ## Operation in Other Countries ##