The best replacement for reach is frequency.

The best alternatives to reach are rated as following:
★★★★★  frequency
★★★★★  black ops
★★★★  rohs
★★★  halo 4
★★★  halo 3
★★  impressions
★★  reached
★★  arrive
★★  engagement
★  achieve
★  firefight
★  richness
★  morthal skyrim
★  tsca
★  odst
★  hidef
★  modern warfare 2
★  effective reach
★  falkreath
★  call of duty black ops
★  reach
★  coverage
★  xellos
★  call of duty
  frequency advertising
  casa marina
  modified sit and reach
  wretch
  top tube
  halo anniversary
  fallout new vegas
  halo 4 graphics
  broad reach
  cod black ops

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

Other search terms related to reach and their ratings are:
★★★★★ design
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Google Trends

Scale is based on the average worldwide traffic of reach in all years. Click on graph for more.
reach
frequency
black ops