I can pick it up too. I am in Kingston, Ontario near the lakeshore, and it's strong. But i could only here the dispatcher and not the mobile. Where u would here both on the 46.180 channel. I was just about to post a comment here, until i saw yours.
I was wondering myself. If there is a new radio network going in on UHF. Or is it specifically a booster
channel to rebroadcast the signal into 46.180 repeaters from the dispatch center, because of possible weak signal problems.
Perhaps someone can check the FCC database to see if a permit was issued for broadcast on this frequency. And obtain the status of broadcast and liscense