As far as I can tell, it is no longer used. Up until several years ago 46.38 was being used to rebroadcast the dispatch channel 6A from the trunked system. From what others had posted in this forum at the time, the low band transmitter was of degrading quality to the point it was turned off.
I have not heard traffic on 46.38 in at least a few years. I have checked the FCC database, and have not found any frequencies that are broadcasting calls on a stand alone channel.