Excellent!
I bought this after getting hooked on the PSK31 app and both work flawlessly. Its seriously cool how charts and images appear from odd radio sounds onto my iPad. Im not a ham and wouldnt even call myself an amateur, but this app is wicked fun! My advice is to follow the same advice offered and use a good pair of headphones and place one side directly on the iPad mic.
If you have a shortwave receiver with an upper side band setting and have never seen a weather chart decoded from sound coming out of your radio, get this app!
Vanz01 about
HF Weather Fax