The best replacement for fm is am.

The best alternatives to fm are rated as following:
★★★★★  am
★★  nfm
★★  im
★★  ul
★★  pm
★  pcm
★  cm
★  dab
★  am radio
★  ssb
★  am longer wavelength
★  fm
★  csa
★  fsk
★  mw
  cf uol
  fifa manager
  am modulation
  atex
  pandora
  am3
  hot 97
  am waves
  cfs
  am wavelength
  1140 am
  am definition
  xm
  internet radio
  am bandwidth
  am radio waves
  dab radio
  slacker
  nikon fm2
  hd radio
  fmc
  era fm
  avispa fukuoka
  muvo v200
  am signal
  imeem

Your alternative for fm is not listed? Suggest!
Speaking about fm, one probably shouldn't forget about mp3 player.

Other search terms related to fm and their ratings are:
★★★★★ mp3 player
★★★★★ speakers
★★★★ usb player
★★★ headset nokia
★ hands free
★ mp3
★ headset sony ericsson
dds
You have in mind a companion for fm and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of fm in all years. Click on graph for more.
fm
am
nfm