i tried

deags@users:~$ tar xf psyBNC-2.3.2-6.tar.gz
tar: This does not look like a tar archive
tar: Skipping to next header
tar: Archive contains obsolescent base-64 headers
tar: Read 9774 bytes from psyBNC-2.3.2-6.tar.gz
tar: Error exit delayed from previous errors

so i had to use this instead

deags@users:~$ gzip -d psyBNC-2.3.2-6.tar.gz
deags@users:~$ tar xf psyBNC-2.3.2-6.tar.gz