Cant get it to work on iPhone 4s

Picked this up on clearance at Radio Shack for $6, so I cant really complain too much. First thing I noticed is that I couldnt get it to work with my iPhone 4s. The app loads but it apparently doesnt recognize the radio attachment. No sound through either the jack on the device or on the iPhone itself. On my new iPad (3) however, it worked just fine. Now they just need to update the app to be iPad native.

Pros:
1. cheap; device was $6 and the app was free
2. nice features for controlling not only the radio from the app but using the device as a remote control for the Music app

Cons:
1. no iPhone 4s support (yet)
2. cant seem to tune in anything except "normal" FM stations; could be that no broadcasters in my area are broadcasting HD yet (Eastern Shore, MD)
3. app is not iPad native (and definitely not Retina iPad native)
4. would be nice if the audio could go through the device speaker instead of just the headphone jacks

Ragle about HD Radio