$5)$ An antenna is kept inside anechoic chamber for getting its S$-$matrix. The Vector network analysis $($VNA$)$ that calibrates the S$-$matrix is present outside the chamber. A coaxial cable $2$m long connects the antenna and the VNA. The operating frequency is $1$GHz$,$ the cable has L$=0\mathrm{.}25$H$/$m; C$=0\mathrm{.}1$pF$/$m$.$ The VNA provides S$11=0\mathrm{.}0128$

Determine actual value by eliminating the cable reflection coefficient.