Final answer:
Satellite radio is a major threat to conventional broadcast radio due to its wider range of programming choices and clear signal.
Step-by-step explanation:
A major threat to conventional broadcast radio is the emergence of satellite radio. Satellite radio uses technology to broadcast a clear signal from space to receivers anywhere in the world. Providers like XM and Sirius offer uninterrupted programming for a subscription fee, giving listeners access to hundreds of program options. This threatens conventional broadcast radio because it offers a wider range of programming choices and a clear signal that is not limited by geography.