The best replacement for fhss is dsss.

The best alternatives to fhss are rated as following:
★★★★★  dsss
★★★★★  fasst
★★★★  dect
★★★  dsm2
★★  s-fhss
★★  ofdm
★  dsmx
★  afhds
★  dss
  gfsk
  fcss
  fast fhss
  futaba fasst

Your alternative for fhss is not listed? Suggest!
Speaking about fhss, one probably shouldn't forget about dsss.

Other search terms related to fhss and their ratings are:
★★★★★ dsss
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Google Trends

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fhss
dsss
fasst