I don't make a lot of product recommendations, but lately have been trying out an iPhone app popular with those who chase storms (... or who are chased by them), Radarscope. It's $9.99, and well worth it.
Have been using it tonight to look at storms my Missouri relatives are seeing: most useful!
Users can select different NEXRAD stations, different radar frequencies, different tilt angles ... see storm tracks, and even draw on the screen.
The radar mode in use is SuperRes Reflectivity, tilt angle 3.