Good replies, however Belfast City and Belfast International aren't the same.
Aldergrove Radar - 128.500
Aldergrove Director/Secondary? 120.900
Aldergrove Tower 118.300
Aldergrove Ground - 121.75
Aldergrove ATIS - 128.200
I don't remember a 120.0?
I suppose I best put a reminder that you shouldn't be listening to the above due to the Wireless Telegraphy Act unless you are a licenced holder and on duty ( slightly simplifed)