There are no spaces between driveletter and share. Try this:
code:
if ingroup("radonc-fac")
  use h: "\\unmcrad\radusers"
  use i: "\\unmcrad\radonc-fac"
endif

if ingroup("radonc-staff")
  use h: "\\unmcrad\radusers"
  use i: "\\unmcrad\radonc-staff"
endif

if ingroup("radonc-rsrch")
  use h: "\\unmcrad\radusers"
  use i: "\\unmcrad\radonc-rsrch"
endif

if ingroup("radonc")
  use j: "\\unmcrad\radonc-share"
endif
And please post code between [CODE] tags.
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There are two types of vessels, submarines and targets.