Sorry, I have to disagree. The radio and the possibilities it presents for adding to the immersion I think are among the more exciting developments in SHIV.
OK perhaps the devs could have made more of it, but people like Tedhealey have already done wondrous things with it: different radio stations with different frequencies and ranges, carrying news and music of the time.
Click on the thread below:
http://www.subsim.com/radioroom/showthread.php?t=109256