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 gocivilairpatrol.com>Programs>Emergency Services>National Emergency Services Academy (NESA)>MAS>NESA MAS.  Once on the NESA site, the documents are in the right hand menu.