From Arizona Repeaters dot Net for Coconino County:
Frequency Status Location Callsign PL-Tone Last Verified Operation Sponsor/comments
145.270 Active Morman Mtn KD7IC - 02/2011 O,E KD7IC
145.410 Active Flagstaff K7NAU 151.4 08/2007 O,PL NAU ARC
145.450 Unknown? Mt Elden NO7AZ 103.5 05/2011 O,PL,A,E,L HF Link MotoTrbo (Closed)
146.780 Active Bill Williams Mtn K7NAZ 91.5 05/2012 O,E,L,PL,IR Bill Williams Mtn Radio Club IRLP Node 3178
146.960 Active Navajo Mtn W7WAC 100.0 10/2011 O,PL,L GCWA Glen Canyon Wireless Association (Page, AZ)linked with the Utah Intermountain Intertie
146.980 Active Mt Elden W7ARA 162.2 02/2011 O,E,PL,A ARA SKYWARN
147.140 Active Mt Elden W7ARA 162.2 02/2011 O,E,PL,L ARA link 147.36 Mt.Ord Rimlink
147.300 Active Jacobs Lake W7NRC None 05/2012 O,L Linked to 146.800 “Snowbird Link Sys”
147.320 Active Hopi Pt WB6JAA None 02/2011 O,E,L,PL IRLP Node 3735
440.400 Defective Flagstaff W7LUX 100.0 04/2011 O,PL NAU ARC
442.075 Unknown? Hopi Pt N7FHQ None 05/2011 O,L,PL -
444.575 Unknown? Tuba City KD7KRA 100.0 08/2007 O,PL -
448.475 Active Mt Elden W7ARA 100.0 02/2011 O,E,A,PL ARA
448.750 Unknown? Navajo Mtn NA7DB None 08/2007 O,E,RM,L -
448.875 Active Mt Elden W7ARA 100.0 04/2011 O,PL,L,E ARA
449.325 Unknown? Mt Elden NO7AZ 103.5 02/2011 O,PL,A,E,L HF Link MotoTrbo (Closed)]
449.600 Active Morman Mtn KD7IC 162.2 02/2011 O,E, PL KD7IC
449.750 Active Bill Williams Mtn K7NAZ 91.5 04/2013 O,PL Recently repaired and back on the air.
449.925 Unknown? Navajo Mtn W7CWI None 08/2007 O Not too sure about this one?
927.0750 Active Bill Williams Mtn WB7BYV 218.1 08/2011 O, PL New
Also be advised there may be MANY repeaters that your son will be able to hit that are on high mountain tops. I am in Tucson and can hit repeaters as far away as Globe, AZ (somewhere around 118 miles away)! And I have no fancy equipment and my antenna is only 10 feet off of the ground!!!
Mike