The theoretical value of the loss in dB as a function of the angle "alpha" of bias error for linear polarization is:  20log(cos(alpha)) Examples: for alpha= 45 degrees :  20log(cos(45)) = 20log(0,707) = -3 dBfor alpha= 60 degrees :  20log(cos(60)) = 20log(0,5) = -6 dBfor alpha= 89 degrees :  20log(cos(89)) = 20log(0,0174)= -35 dB 73 de Roland PY4ZBZ