Well, that was fast. Satellite radio already has a 4.2 percent penetration, driven in good part by young adults, according to a MediaPost report on BIGresearch figures. Another 2.5 percent of respondents said that they intended to buy satellite radio receivers in the next six months. Another 16.1 percent said they intended to get satellite radio someday in the future beyond that. 52.6 percent said they didn't think they had a need for it, and 24.6 percent said they didn't yet know enough about it.