What is the recommended procedure on how to use the DF equipment for ELT searches in aircraft? Flight patterns to positively locate targets? Needle interpretations? Suggested altitudes? Use of sensitivity control?

The search and rescue patterns and procedures recommended for various types of searches can be found at capmembers.com>CAP Operations>NESA Curriculum.  Once on the NESA site, click on "Schools" and in the drop down, "Curriculum Materials".  Once in the NESA curriculum material, click on MAS Curriculum and you will have access to all the available information.