05 Sep 2014 News for NTIA/ITS HF Propagation Models (WINDOWS version) 05 Sep 2014 1. There was an error in the area coverage calculation for the Type 48 antenna (NOSC Inverted Cone). This only affects this antenna. But the error was in all 3 propagation models (VOACAP, ICEPAC, REC533). It was caused by a misspelled variable name. 2. It has been so long since I put out a new version, I hope other problems do not occur. :) This version had some problems and was removed from the download.