Impossible to read the two attachments, try doing a screen capture, not taking a photo of the screen. And, who do you mean by "them", the helicopters? They appear under the civil aircraft call signs in ADS-B. If it's ADS-B you're trying to use with a discone your shooting yourself in the foot (basically deaf approaching 800Mhz and above) and the fact you say you're splitting the antenna feed between a bunch of radios isn't going to be helping either unless you have coax that's not lossy at 1 GHz (read HELIAX or at LEAST LMR400) and you're using a multicoupler that's also good for 1 GHz with MINIMAL loss between it's input and any of the outputs. TV splitters etc are plain and simply inadequate for this type of performance expectation.
LIVE as I write this from FR24 and also from my local ADS-B receiver:
View attachment 124998
View attachment 124999
As for the voice traffic, if you're thinking you're going to hear the repeater on 413.6875 from Hagersville I don't think it's going to happen, It's located north of Toronto and even from 2/3 the distance to it that you are it's not strong here near Milton. Try listening to the input on 418.6875, that'll let you hear the helicopters themselves when in the area, which at 1000' to 3500' AGL you'll stand a much better chance of receiving from time to time.