The best replacement for xm is sirius radio.

The best alternatives to xm are rated as following:
★★★★★  sirius radio
★★★★★  sirius
★★★  pandora
★★  sirius satellite radio
★★  sirius which is better
★  sirius channels
★  fm
★  serious
★  cirrus
★  sirius subscribers
★  sirius sound quality
★  xl
★  sirius satellite
★  sirius reception
★  xp
★  hd radio
  sirius quality
  serius
  siri
  sirrus
  ads-b weather
  sirus
  slacker radio
  500r
  satellite radio
  proclimb
  radio
  pro rmk
  xl xen
  sirius canada
  qm

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Speaking about xm, one probably shouldn't forget about best of sirius.

Other search terms related to xm and their ratings are:
★★★★★ best of sirius
★★★ sirius
aol
napster
sonos
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Google Trends

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