I truly believe that NE AZ is best. When I spoke to George Green he said to get as close to the 4 corners area as possible & stay close to the Reservations. We're currently looking NE of St. John's, maybe Holbrook.
Sedona - no good because of FEMA camps
Flagstaff & Phx & Tucson - no good because of size & nuclear fall-out patterns.
http://www.ki4u.com/webpal/d_resources/index.htm