hi please help i have a 436 & 325 i live about 30 miles northwest of nyc. i can pick up most frequencies with no issues. i have an issue with uhf & 800 doitt systems from nyc. the uhf's were fine & then last week could not receive anything. I have made multiple calls to uniden on 436 upgraded from sentinel. changed batteries and antennaes. i dont have an outside antennae. according to uniden if it worked before should work now. Ive read the manual & changed range settings in scanner. Any help would be greatly appreciated, They are installing sewers where i live could that have caused an issue with metal etc? when i get closer to work closer to nyc both scanners work fine. Any ideas thank you.