Looking at there licenses on FCC website......UHF seems to be a new flavor ....but poke 155.250 in and see where that leads you. MY guess......Highband dispatch......UHF to operate on....i dont live out that way but i found on the web they got a 6 million dolla grant to upgrade.
Yea I was poking at ULS and found one of the licenses expired 10+ years ago, but didn't see any licenses for 46.18. What callsign did you see for that freq?