The best replacement for 5.8 is 2.4.

The best alternatives to 5.8 are rated as following:
★★★★★  2.4
★★★★  2.4 fpv
★★★  5.4
★★★  5.0
★★  6.0
★★  2.4 ghz
★★  dect
★★  6.3
★★  2.4 av sender
★  900 fpv
★  1.3 fpv
★  2.4 ghz cordless phone
★  dect 6.0
★  6.2
★  5.9
★  1.2 fpv
★  2.4 cordless phone
  note 2
  2.4 wifi
  grand
  5.0 bronco
  5.12
  2.4 phone
  2.4 gigahertz
  6.0 dect
  mixamp
  1.9 ghz
  chevy 5.7
  2.4 cordless phones
  samsung grand duos
  2.4 phones
  5.10
  samsung galaxy mega 6.3
  samsung mega 6.3

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5.8
2.4
2.4 fpv