For Phase II you would need a BCD536HP or BCD436HP.
You should be able to listen to the ambulance service on the older system with the 246T provided they don't use 700 MHz. and with the 346, provided there is no digital and it is not encrypted, other wise you would need a BCD396XT. No scanner will decode encryption.
You may also want to inquire in the Canada Forum and see what others in your area are using.