Signal loss on an unmatched transmission line

*signal source
V        1 0 AC 1    

*network           
Rout     1 2 15                 
Trmln    2 0 3 4 Z0=75 TD=0.5u  
Rmatch   3 4 100k               
Runfloat 4 0 100G

.AC dec 150 1 10000k           
.PROBE


*#* log file created using Probe version 4.04 on 12/11/101 at 17:58
*#Add_trace
*#v(2) V(3)
*#X_axis
*#Set_range
*#1 20k