The best replacement for k40 is valentine 1.

The best alternatives to k40 are rated as following:
★★★★★  valentine 1
★★★★★  wilson 1000
★★★★  valentine
★★★★  k45
★★★★  k60
★★★  9500ci
★★★  escort
★★★  k20
★★★  k6000
★★  valentine one
★★  k9
★★  little wil
★★  k60 keurig
★★  b40
★★  k65
★  wilson 5000
★  escort 9500ix
★  wilson antenna
★  firestik
★  escort 9500ci
★  mk40
  blinder
  k9 kahr
  firestick
  k10

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k40
valentine 1
wilson 1000