Which statement is true regarding the functionality of Sirius radio receivers?

Sirius radio receivers are designed to operate using both satellite and repeater signals, which allows them to provide coverage in a variety of environments. The satellite signals enable Sirius receivers to stream audio content directly from satellites orbiting the Earth, while repeater signals are utilized to enhance coverage in areas where satellite signals may be weak, such as urban environments with tall buildings or mountainous regions. This dual functionality ensures that users can enjoy continuous service regardless of their location, making them versatile for both indoor and outdoor use.

The other options do not accurately describe the functionality of Sirius radio receivers. For instance, they can function outside as well as indoors, and while weather conditions may occasionally influence signal quality, they do not solely rely on local weather to receive their broadcast. Additionally, Sirius receivers do require an antenna to receive signals effectively, as the antenna plays a crucial role in capturing both satellite and terrestrial broadcasts.