The best replacement for sirius radio is xm.

The best alternatives to sirius radio are rated as following:
★★★★★  xm
★★★★★  xm radio
★★  xm satellite
★  sirius xm
  radio
  xfm
  internet radio
  tune in radio
  regular radio
  xfm radio

Your alternative for sirius radio is not listed? Suggest!
Speaking about sirius radio, one probably shouldn't forget about static.

Other search terms related to sirius radio and their ratings are:
★★★★★ static
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Google Trends

Scale is based on the average worldwide traffic of sirius radio in all years. Click on graph for more.
sirius radio
xm
xm radio