I haven't heard any Tish PD activity on 155.490 thus far. I keep the squelch pretty high on my radio with the logging program I'm using but I can pick up Greenville PD and Seagoville FD, which are both farther away and on the same frequency. Either they are using something else, have very little radio traffic, or the base antenna is not very high. I need to schedule a trip to the wildlife refuge up there and investigate further while there.