Main civil frequencies will be:
Low Level
119.875 Flight Information
127.275 GOW-INS
124.5 GOW-ADN
High Level
126.925
(occasionally 132.490)
Outside the area you describe, there will be high level traffic coming from/transferring to:
133.675
129.225
134.775
135.855
132.730
129.1
Cheers