Eric,

I have never played with SDR Sharp.

I find HRD to be usable but by no means fully accessible.  I use the 
free version which I run primarily as a satellite tracking package. I've 
never set it up to control a radio or antenna system.  As far as 
satellite tracking and pass prediction it works.

I think if a good Jaws, window eyes or NVDA scripter sat down and wrote 
some code the entire package could probably be made fully accessible.  
Some of the basics seem to be there.

Dave