Ho stats shows weak signal in UL and Both link, we put Tower mounted amp (TMAs) and now the path balance is ok.The two sites of two sectors which are in each side of the tunnel mouth are located in the same BSCs (no inter BSC handover involve).The two sites are loacated each end of the tunnel.Each tunnel side has two antennas Rx, and RX/Tx lines.Still have drop calls. Seems to be too much reflection in the tunnel…lots of traffic with big truck blocking but rx signal what we get out of the antennas seems to be very good..the tunnel is gradually goes down and slowly comes up..no sharp bend or anything like that.Any help will be appreciated.