-su-2.05b# cd /usr/src/
-su-2.05b# patch -p0 < ~duckdown/patch/ath.patch
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Index: if_ath.c
|===================================================================
|RCS file: /usr/ncvs/src/sys/dev/ath/if_ath.c,v
|retrieving revision 1.106
|diff -u -r1.106 if_ath.c
|--- if_ath.c   15 Nov 2005 05:49:02 -0000      1.106
|+++ if_ath.c   11 Dec 2005 03:29:49 -0000
--------------------------
File to patch: 
No file found--skip this patch? [n] ^C
-su-2.05b#