Assuming TG58 is Reilly Ch 1 is a relatively safe bet especially if you hear reference to a ch2. Usually when a user is assigned TGs at the radio shop end they pick sequential numbers EG 57,58,59 etc. This makes controlling the data base at the system level a lot easier. There are numerous cases where a specific company has sequential TGs in the database.
Those really paying attention will notice too that whole groups of TGs are assigned to individual radio shops. Like TG1000 to 2000 will all be users from that radio shop. This can be used to help whittle down a possible user. Eg TG 123 sounds like a taxi service. TG0001 to TG0500 is assigned to the radio shop in "Radio County". There are two taxi services in "Radio County". One "Super Taxi" is heard on 155.555 and has VHF antennas. The other "RR Taxi" has UHF antennas and has not been located yet. Based on the above information TG123 is RR Taxi.
