Well, don't forget that many smart phones have a DSP FM radio receiver built-in. They seem pretty sensitive, and selective, as well, as long as you have a headphone cord to act as an antenna, like the 1980's Walkman's. So, your question of, "But how many 19 year kids have FM receivers in their dorm rooms?" Well, if a DSP FM receiver function is built-in to their smart phones, then the answer could be, just about every one of them.