I have been playing with my new 536 this afternoon and thought this might help someone. I get nearly flawless reception after setting the P25 Threshold setting to "Manual" and then setting the P25 Threshold Level to 8. I started at 3 and got nothing. 4 and 5 seemed good, but if you follow the steps listed online about the auto adjustment, it shows 8 and when I set it to 8 I seem to be getting great reception with error rates below 40 consistently. Bye the way, I am in Butler County, so signal strength is only around 50-60% also but seems to be decoding very well.