We might be able to add a receiver for further splitting but not before we understand the use of repeaters around CYUL.
Any news on this new YUL setup ?
After some more listening I think I have a better understanding of the frequencies used by the Terminal.
I see you still have the Departure frequency of 120.425 on the Center radio. This frequency seems to be linked/cross-coupled with the other Terminal frequencies of 125.150 and 134.150 most of the time, which results in you hearing the same thing on both the Center and Arrival/Departure feeds when these frequencies are in use.
It would make sense to move 120.425 to the Arrivals/Departure feed to avoid this overlap. Ideally if you were going to split the feed into two you would have 120.425/125.150/134.150/124.650 on one and the arrival frequencies 132.850/118.900/126.900 on the other. That seems to be how they generally split the airspace and would probably give you an equal mix of traffic with minimal overlap.
As far as the Center goes I did hear them using 132.55 but only once, this is the same sector where 132.350 seems to be the normal frequency used low altitude to the east.
If it's feasible any chance you could try a test on the Center feed with all the adjacent low altitude Montreal sectors to see how it sounds ? Remove 120.425 and 125.150 (if it's on there) and scan the following (with delay - OFF, if its an option) ..
135.600
126.575
128.775
134.975
132.550
132.350
128.225
I suspect you will only hear the controller on 135.600, and it seems intermittent, but the reception of aircraft appears to be pretty good.
Thanks for any info.