Hi, I originally contacted RH support about this, ticket number 138548, and they suggested I enter this as a bug report. When upgrading from RH 5.x to 6.x, man output displays <AD> in reverse video at the end of certain lines. I have observed this on several different hardware configurations. If you do an install (vs. upgrade) of RH 6.x on the same machine, the problem goes away.
I had the same problem when upgrading man-1.5g-2 to man-1.5g-6. The fix, as reported in the manpage of man, is to put a LESSCHARSET=latin1 in the environment. It worked for me.
Well, I guess I reported a known bug here. Sorry 'bout that. I will write RTFM(anpage) on my whiteboard 1000 times. Many thanks to Olivier, who made me see the light. *** This bug has been marked as a duplicate of 6500 ***