Harvey You're in luck.There are two known ancestors of the Franklin Co, IL REAs who have had Y-DNA testing. One is a descendant of Wilson Rea, through his son Abraham.The other is a descendant of Wilson's brother, Abner (Sr), through his son Abner Jr.
Their kit #'s are 135256 and 13689, respectively.I cannot speak as to how these results may relate to a genetic signature of the Macrae clan.From the Rea DNA project data you will notice that there are 20+ genetically different families which use the surname Rea/Ray/Rhea/etc. [By "genetically different" I mean that it's extremely unlikely these various Ray/etc families shared a common male ancestor anytime since surnames came into use.]
The Rea's of Franklin Co, IL have been well-researched by a number of people.Wilson Rea, his brother Abner Rea and his sister Jane (Rea) Overturf were early settlers of Franklin Co, IL.Descendants still live in the area.I believe the lineage is well-documented back through William Collin(g)s Rea and his father James Rea, who died in Henry Co, VA ~1788/9. See one of the WorldConnect Trees, for example: http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=cjrkhillphotos&id=I05964http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=cjrkhillphotos&id=I05964
Email me privately and I might be able to point you to more sources. -- Roger Ray