I've been scanning the Radabaugh postings now and then.

Just a reminder to this group -- I did a genealogy about 10 years ago that had a large (70 page) appendix devoted to all of the Rodabaugh/Rodenbeck/Radenbaugh/Radabaugh (the R*d/t*b*ck/ch cognates) lines in the U.S. The genealogy is on the web, but the Appendix is only in the print version. Copies of this genealogy are still available. It is described at http://www.sheridanc.on.ca/~kem/Htmlgen/ctnrodad.htm.
A couple of the lines ended up using the Rodenbeck spelling in the twentieth century.