In article ,
Jim Burns wrote:
Does anybody know the typical range of the DME signal when DME is installed
in conjunction with a localizer or ILS?

Questions like this are best answered by reading the AIM, Chapter 1
(Navigation Aids). It's on line at http://www.faa.gov/ATpubs/AIM/.

A quick read of Section 1-1-7 says range is up to 199 nm, at altitudes
high enough to have line-of-sight to the ground station. There's
nothing in there that leads me to believe that a DME co-located with
an ILS is any different from one co-located with a VOR.